/* 修改字段
* IL:
* void Action(TInstance instance, TField value) {
* 1. 载入第一参数:
* ldarg.0
* 2. 转换实例类型: (如果需要)
*
*
* 3. 载入第二参数:
* ldarg.1
* 4. 转换字段类型: (如果需要)
*
*
* 5. 修改字段:
* {OpCode} {FieldTypeName} {TargetTypeName::FieldName}
* {OpCode}:
* 1). 实例: stfld;
* 2). 静态: stsfld;
* {FieldTypeName}:
* 1). 标量类型: "{TypeName}";
* 2). 引用类型: "class {TypeName}";
* 3). 数值类型: "valuetype {TypeName}";
*
* 6. 退出方法
* ret
* }
*/
Delegate InternalFieldSetWithDynamic(FieldInfo member, Type instance, Type value)
{
var field = member.FieldType;
if (value == null)
{
value = field;
}
if (!member.IsStatic)
{
var reflected = member.ReflectedType;
if (instance == null)
{
instance = reflected;
}
var @dynamic = CreateDynamicMethod(null, new[] { instance, value }, _DynamicOptionsField, member);
var il = @dynamic.GetILGenerator();
il.Emit(OpCodes.Ldarg_0);
ConvertIfNeeded(il, reflected, instance); //
il.Emit(OpCodes.Ldarg_1);
ConvertIfNeeded(il, field, value); //
il.Emit(OpCodes.Stfld, member);
il.Emit(OpCodes.Ret);
return(@dynamic.CreateDelegate(TypeMemberSetInstance.MakeGenericType(new[] { instance, value })));
}
else
{
if (instance != null)
{
throw new ArgumentException();
}
var @dynamic = CreateDynamicMethod(null, new[] { value }, _DynamicOptionsField, member);
var il = @dynamic.GetILGenerator();
il.Emit(OpCodes.Ldarg_0);
ConvertIfNeeded(il, field, value); //
il.Emit(OpCodes.Stsfld, member);
il.Emit(OpCodes.Ret);
return(@dynamic.CreateDelegate(TypeMemberSetStatic.MakeGenericType(new[] { value })));
}
}
/* 修改属性
* // IL代码: 实际访问 set_PropertyName() 方法;
*
* 1. 载入第一参数:
* ldarg.0
* 2. 转换实例类型: (如果需要)
*
*
* 3. 载入第二参数:
* ldarg.1
* 4. 转换字段类型: (如果需要)
*
*
* 5. 修改字段:
* {OpCode} void {TargetTypeName}::set_PropertyName({PropertyTypeName})
* {OpCode}:
* 1). 实例: callvirt instance;
* 2). 静态: call;
* {PropertyTypeName}:
* 1). 标量类型: "{TypeName}";
* 2). 引用类型: "class {TypeName}";
* 3). 数值类型: "valuetype {TypeName}";
*
* 6. 退出方法
* ret
*/
Delegate InternalPropertySetWithDynamic(PropertyInfo member, Type instance, Type value)
{
var method = member.GetSetMethod(true);
var property = member.PropertyType;
if (value == null)
{
value = property;
}
if (!method.IsStatic)
{
var reflected = method.ReflectedType;
if (instance == null)
{
instance = reflected;
}
var @dynamic = CreateDynamicMethod(null, new[] { instance, value }, _DynamicOptionsProperty, member);
var il = @dynamic.GetILGenerator();
il.Emit(OpCodes.Ldarg_0);
ConvertIfNeeded(il, reflected, instance); //
il.Emit(OpCodes.Ldarg_1);
ConvertIfNeeded(il, property, value); //
if (reflected.IsValueType)
{
il.EmitCall(OpCodes.Call, method, null);
}
else
{
il.EmitCall(OpCodes.Callvirt, method, null);
}
il.Emit(OpCodes.Ret);
return(@dynamic.CreateDelegate(TypeMemberSetInstance.MakeGenericType(new[] { instance, value })));
}
else
{
if (instance != null)
{
throw Error.StaticObjectCannotConvertType("instance");
}
var @dynamic = CreateDynamicMethod(null, new[] { value }, _DynamicOptionsProperty, member);
var il = @dynamic.GetILGenerator();
il.Emit(OpCodes.Ldarg_0);
ConvertIfNeeded(il, property, value); //
il.EmitCall(OpCodes.Call, method, null);
il.Emit(OpCodes.Ret);
return(@dynamic.CreateDelegate(TypeMemberSetStatic.MakeGenericType(new[] { value })));
}
}
