我想概括如下IL(从反射镜):
.method private hidebysig instance void SetValue(valuetype Test.TestFixture/ValueSource& thing, string 'value') cil managed
{
.maxstack 8
L_0000: nop
L_0001: ldarg.1
L_0002: ldarg.2
L_0003: call instance void Test.TestFixture/ValueSource::set_Value(string)
L_0008: nop
L_0009: ret
}
然而,当我试图重现此IL与DynamicMethod的:
[Test]
public void Test_with_DynamicMethod()
{
var sourceType = typeof(ValueSource);
PropertyInfo property = sourceType.GetProperty("Value");
var setter = property.GetSetMethod(true);
var method = new DynamicMethod("Set" + property.Name, null, new[] { sourceType.MakeByRefType(), typeof(string) }, true);
var gen = method.GetILGenerator();
gen.Emit(OpCodes.Ldarg_1); // Load input to stack
gen.Emit(OpCodes.Ldarg_2); // Load value to stack
gen.Emit(OpCodes.Call, setter); // Call the setter method
gen.Emit(OpCodes.Ret);
var result = (SetValueDelegate)method.CreateDelegate(typeof(SetValueDelegate));
var source = new ValueSource();
result(ref source, "hello");
source.Value.ShouldEqual("hello");
}
public delegate void SetValueDelegate(ref ValueSource source, string value);
我得到的“操作可能会破坏运行时”异常。 该IL似乎等同于我,任何想法? ValueSource是值类型,这就是为什么我在这里做一个ref参数。
编辑
这里的ValueSource类型:
public struct ValueSource
{
public string Value { get; set; }
}