1
我想建立lambda表达式:联合LAMBDA动态创建
Expression<Func<MyObject, bool>> predicate = PredicateBuilder.False<MyObject>();
var param = Expression.Parameter(typeof(MyObject), "f");
if (myOperator == OperateurEnum.EG)
{
var body = Expression.Equal(
Expression.PropertyOrField(param, myProperty),
Expression.Constant(myFilterValue)
);
var lambda = Expression.Lambda<Func<MyObject, bool>>(body, param);
predicate = predicate.Or(lambda);
}
else if (myOperator == OperateurEnum.CT)
{
var body = Expression.Call(
Expression.PropertyOrField(param, myProperty),
"StartsWith",
null,
Expression.Constant(myFilterValue)
);
var lambda = Expression.Lambda<Func<MyObject, bool>>(body, param);
predicate = predicate.Or(lambda);
}
else if()
{
...
}
var myEx = Expression.Lambda<Func<MyObject, bool>>(predicate.Body, param);
Func<MyObject, bool> lambdaDelegate = myEx.Compile();
我用PredicateBuilder,但我得到这个错误:
变量类型的'F 'ProactisMvc.Web.ProactisWsServiceReference.Offre'从范围''引用,但未定义
有什么问题?还有其他解决方案吗?
它的工作原理。谢谢! – twisted