|
public static Lambda ( Type lambdaType, Expression body, IEnumerable |
||
| lambdaType | Type | |
| body | Expression | |
| parameterExpression | IEnumerable |
|
| scope | IScope | |
| visitor | INRefcatoryExpressionVisitor | |
| return | ||
public Expression Update(Expression body, Type type, IEnumerable <ParameterExpression> parameters)
{
if (Body.Equals(body) && Type.Equals(type) && ReferenceEquals(Parameters, parameters))
{
return(this);
}
return(AstExpression.Lambda(InternalType, Body, Parameters, ParentScope, Visitor));
}
private Expression ReduceBaseAssignment(Base expression)
{
Type returnType = null;
Delegate @delegate = null;
MethodInfo methodInfo = null;
ILGenerator ilGenerator = null;
DynamicMethod dynamicMethod = null;
Type delegateType = typeof(Func <, ,>);
MethodDefinition methodDefinition = null;
var expressionType = expression.Type;
ParameterExpression assignedValue = null;
var propertyReference = _memberReferenceExpression.Annotation <PropertyDefinition>();
methodDefinition = propertyReference.GetMethod;
methodInfo = methodDefinition.GetActualMethod <MethodInfo>();
returnType = InternalType = methodInfo.ReturnType;
assignedValue = AstExpression.Parameter(returnType);
methodDefinition = propertyReference.SetMethod;
methodInfo = methodDefinition.GetActualMethod <MethodInfo>();
dynamicMethod = new DynamicMethod(string.Format("Base_{0}", methodInfo.Name), returnType, new Type[] { expressionType, returnType }, expressionType);
ilGenerator = dynamicMethod.GetILGenerator();
ilGenerator.Emit(OpCodes.Ldarg_0);
ilGenerator.Emit(OpCodes.Ldarg_1);
ilGenerator.EmitCall(OpCodes.Call, methodInfo, null);
ilGenerator.Emit(OpCodes.Ldarg_1);
ilGenerator.Emit(OpCodes.Ret);
delegateType = delegateType.MakeGenericType(expressionType, returnType, returnType);
@delegate = dynamicMethod.CreateDelegate(delegateType);
return(AstExpression.Lambda(
AstExpression.GetFuncType(returnType, returnType),
AstExpression.Invoke(AstExpression.Constant(@delegate), Expression, assignedValue),
new ParameterExpression[] { assignedValue },
ParentScope, Visitor));
}