/// <summary>
/// 创建属性的获取器委托。
/// </summary>
/// <param name="propertyInfo">属性元数据。</param>
/// <returns>属性获取器的委托。</returns>
public static DynamicMemberGetter CreatePropertyGetter(this PropertyInfo propertyInfo)
{
if (propertyInfo == null)
{
throw new ArgumentNullException(nameof(propertyInfo));
}
return(GetterCache.GetOrAdd(propertyInfo, m =>
{
var declaringType = propertyInfo.DeclaringType;
var methodInfo = propertyInfo.GetGetMethod(true);
if (methodInfo == null)
{
return null;
}
var emit = new EmitHelper(DefineTypes.Object, new Type[] { DefineTypes.Object }, declaringType);
var isStatic = methodInfo.IsStatic;
if (!isStatic)
{
emit.ldarg_0
.castType(declaringType)
.callvirt(methodInfo)
.end();
}
else
{
emit.call(methodInfo)
.end();
}
emit.boxIfValueType(propertyInfo.PropertyType)
.ret();
return emit.CreateDelegate <DynamicMemberGetter>();
}));
}
/// <summary>
/// 创建属性的设置器委托。
/// </summary>
/// <param name="propertyInfo">属性元数据。</param>
/// <returns>属性获取器的委托。</returns>
public static DynamicMemberSetter CreatePropertySetter(this PropertyInfo propertyInfo)
{
if (propertyInfo == null)
{
throw new ArgumentNullException(nameof(propertyInfo));
}
return(SetterCache.GetOrAdd(propertyInfo, m =>
{
var declaringType = propertyInfo.DeclaringType;
var methodInfo = propertyInfo.GetSetMethod(true);
if (methodInfo == null)
{
return null;
}
var emit = new EmitHelper(DefineTypes.Void, new Type[] { DefineTypes.Object, DefineTypes.Object }, declaringType);
var isStatic = methodInfo.IsStatic;
if (!isStatic)
{
emit.ldarg_0
.castType(declaringType)
.end();
}
emit.ldtoken(propertyInfo.PropertyType)
.call(GetTypeFromHandleMethod)
.ldarg_1
.call(ChangeTypeMethod)
.castType_any(propertyInfo.PropertyType)
.call(isStatic, methodInfo)
.ret()
.end();
return emit.CreateDelegate <DynamicMemberSetter>();
}));
}
static void CreateParameterLocals(int argsIndex, EmitHelper emit, ParameterInfo[] parameterInfos, int parameterLength, LocalBuilder[] parameterLocals, ref bool hasByRef)
{
for (int i = 0; i < parameterLength; i++)
{
var parameterInfo = parameterInfos[i];
var parameterType = parameterInfo.ParameterType;
if (parameterType.IsByRef)
{
parameterType = parameterType.GetElementType();
hasByRef = true;
}
var local = emit.DeclareLocal(parameterType);
parameterLocals[i] = local;
emit.ldtoken(parameterType)
.call(GetTypeFromHandleMethod)
.ldarg(argsIndex) //- 取出参数1 也就是 object[]
.ldc_i4_(i) //- 指定索引号 —— n
.ldelem_ref //- 取出索引元素 object[n]
.call(ChangeTypeMethod)
.castType_any(parameterType)
.stloc(local)
.end();
}
}