314 lines
10 KiB
C#
314 lines
10 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Data;
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using System.Data.Common;
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using System.Linq;
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using System.Reflection;
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using System.Reflection.Emit;
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using System.Text;
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namespace SqlSugar
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{
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public static class ReflectionExtensions
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{
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/// <summary>
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/// 检查输入值是否为空
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/// </summary>
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/// <param name="val"></param>
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/// <returns></returns>
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static bool isNullOrEmpty(object val)
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{
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if (val == null) return true;
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if (val.ToString() == "") return true;
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return false;
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}
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/// <summary>Delegate to set an arbitrary property at runtime.</summary>
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/// <param name="target">the object instance whose property will be modified.</param>
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/// <param name="parameter"></param>
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public delegate void FastPropertySetHandler(object target, object parameter);
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/// <summary>
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/// 用于存放SetPropertySetter的Dictionary
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/// </summary>
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private static Dictionary<PropertyInfo, FastPropertySetHandler> dictSetter = new Dictionary<PropertyInfo, FastPropertySetHandler>();
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/// <summary>
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/// 快速设置成员属性
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/// </summary>
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/// <param name="propInfo"></param>
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/// <returns></returns>
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public static FastPropertySetHandler GetPropertySetter(PropertyInfo propInfo)
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{
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lock (dictSetter)
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{
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if (dictSetter.ContainsKey(propInfo)) return dictSetter[propInfo];
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// generates a dynamic method to generate a FastPropertySetHandler delegate
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DynamicMethod dynamicMethod = new DynamicMethod(string.Empty, null, new Type[] { typeof(object), typeof(object) }, propInfo.DeclaringType.Module);
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ILGenerator ilGenerator = dynamicMethod.GetILGenerator();
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// loads the object into the stack
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ilGenerator.Emit(OpCodes.Ldarg_0);
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// loads the parameter from the stack
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ilGenerator.Emit(OpCodes.Ldarg_1);
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// cast to the proper type (unboxing if needed)
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EmitCastToReference(ilGenerator, propInfo.PropertyType);
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// calls the setter
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ilGenerator.EmitCall(OpCodes.Callvirt, propInfo.GetSetMethod(), null);
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// terminates the call
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ilGenerator.Emit(OpCodes.Ret);
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// converts the DynamicMethod to a FastPropertyGetHandler delegate to get the property
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FastPropertySetHandler setter = (FastPropertySetHandler)dynamicMethod.CreateDelegate(typeof(FastPropertySetHandler));
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dictSetter.Add(propInfo, setter);
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return setter;
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}
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}
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/// <summary>Emits the cast to a reference, unboxing if needed.</summary>
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/// <param name="ilGenerator">The MSIL generator.</param>
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/// <param name="type">The type to cast.</param>
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private static void EmitCastToReference(ILGenerator ilGenerator, System.Type type)
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{
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if (type.IsValueType)
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{
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ilGenerator.Emit(OpCodes.Unbox_Any, type);
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}
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else
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{
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ilGenerator.Emit(OpCodes.Castclass, type);
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}
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}
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/// <summary>
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/// 根据数据类型将指定数据进行相应转换
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/// </summary>
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/// <param name="value"></param>
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/// <param name="type"></param>
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/// <returns></returns>
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public static object ConvertForType(object value, Type type)
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{
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if (Convert.IsDBNull(value) || (value == null))
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{
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return null;
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}
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string typeName = type.FullName.ToString();
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if (type == typeof(System.Nullable<UInt16>))
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{
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value = Convert.ToUInt16(value);
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}
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else if (type == typeof(System.Nullable<UInt32>))
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{
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value = Convert.ToUInt32(value);
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}
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else if (type == typeof(System.Nullable<UInt64>))
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{
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value = Convert.ToUInt64(value);
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}
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else if (type == typeof(System.Nullable<Int32>))
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{
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value = Convert.ToInt32(value);
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}
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else if (type == typeof(System.Nullable<Int64>))
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{
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value = Convert.ToInt64(value);
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}
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else if (type == typeof(System.Nullable<DateTime>))
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{
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value = Convert.ToDateTime(value);
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}
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switch (typeName)
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{
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case "System.String":
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if (!isNullOrEmpty(value))
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value = value.ToString();
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else
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value = string.Empty;
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break;
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case "System.Boolean":
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if (!isNullOrEmpty(value))
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value = Convert.ToBoolean(value);
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break;
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case "System.Int16":
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if (!isNullOrEmpty(value))
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value = Convert.ToInt16(value);
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break;
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case "System.Int32":
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if (!isNullOrEmpty(value))
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value = Convert.ToInt32(value);
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else
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value = 0;
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break;
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case "System.Int64":
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if (!isNullOrEmpty(value))
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value = Convert.ToInt64(value);
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else
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value = 0;
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break;
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case "System.Double":
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if (!isNullOrEmpty(value))
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value = Convert.ToDouble(value);
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else
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value = 0.00;
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break;
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case "System.Float":
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if (!isNullOrEmpty(value))
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value = Convert.ToDouble(value);
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else
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value = 0.00;
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break;
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case "System.Single":
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if (!isNullOrEmpty(value))
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value = Convert.ToSingle(value);
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break;
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case "System.Decimal":
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if (!isNullOrEmpty(value))
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value = Convert.ToDecimal(value);
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else
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value = 0.00;
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break;
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case "System.DateTime":
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if (!isNullOrEmpty(value))
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value = Convert.ToDateTime(value);
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else
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value = DateTime.MinValue;
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break;
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}
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return value;
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}
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/// <summary>
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/// 设置属性值
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/// </summary>
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/// <param name="obj"></param>
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/// <param name="property"></param>
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/// <param name="value"></param>
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public static void SetPropertyValue(object obj, PropertyInfo property, object value)
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{
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if (property.CanWrite)
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{
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var propertySetter = GetPropertySetter(property);
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value = ConvertForType(value, property.PropertyType);
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if (value != null)
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{
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if (property.PropertyType.BaseType.Name == "Enum")
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{
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propertySetter(obj, Enum.Parse(property.PropertyType, value.ToString()));
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}
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else
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propertySetter(obj, value);
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}
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}
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}
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/// <summary>
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/// 设置属性值
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/// </summary>
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/// <param name="obj"></param>
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/// <param name="propertyName"></param>
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/// <param name="value"></param>
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public static void SetPropertyValue(object obj, string propertyName, object value)
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{
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SetPropertyValue(obj.GetType(), obj, propertyName, value);
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}
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/// <summary>
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/// 设置属性值
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/// </summary>
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/// <param name="type"></param>
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/// <param name="obj"></param>
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/// <param name="propertyName"></param>
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/// <param name="value"></param>
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public static void SetPropertyValue(Type type, object obj, string propertyName, object value)
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{
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PropertyInfo property = type.GetProperty(propertyName);
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if (property != null)
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{
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SetPropertyValue(obj, property, value);
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}
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}
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public static Type GetTypeInfo(this Type typeInfo)
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{
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return typeInfo;
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}
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public static Type[] GetGenericArguments(this Type type)
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{
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var reval = type.GetTypeInfo().GetGenericArguments();
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return reval;
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}
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public static bool IsGenericType(this Type type)
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{
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var reval = type.GetTypeInfo().IsGenericType;
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return reval;
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}
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public static PropertyInfo[] GetProperties(this Type type)
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{
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var reval = type.GetTypeInfo().GetProperties();
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return reval;
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}
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public static PropertyInfo GetProperty(this Type type, string name)
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{
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var reval = type.GetTypeInfo().GetProperty(name);
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return reval;
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}
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public static FieldInfo GetField(this Type type, string name)
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{
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var reval = type.GetTypeInfo().GetField(name);
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return reval;
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}
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public static bool IsEnum(this Type type)
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{
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var reval = type.GetTypeInfo().IsEnum;
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return reval;
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}
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public static MethodInfo GetMethod(this Type type, string name)
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{
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var reval = type.GetTypeInfo().GetMethod(name);
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return reval;
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}
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public static MethodInfo GetMethod(this Type type, string name, Type[] types)
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{
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var reval = type.GetTypeInfo().GetMethod(name, types);
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return reval;
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}
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public static ConstructorInfo GetConstructor(this Type type, Type[] types)
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{
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var reval = type.GetTypeInfo().GetConstructor(types);
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return reval;
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}
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public static bool IsValueType(this Type type)
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{
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return type.GetTypeInfo().IsValueType;
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}
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public static bool IsEntity(this Type type)
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{
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return type.GetTypeInfo().IsClass;
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}
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public static Type ReflectedType(this MethodInfo method)
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{
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return method.ReflectedType;
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}
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}
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}
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