1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
|
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;
namespace System.Web.Util {
internal static class QueryableUtility {
private static readonly string[] _orderMethods = new[] { "OrderBy", "ThenBy", "OrderByDescending", "ThenByDescending" };
private static readonly MethodInfo[] _methods = typeof(Queryable).GetMethods(BindingFlags.Public | BindingFlags.Static);
private static MethodInfo GetQueryableMethod(Expression expression) {
if (expression.NodeType == ExpressionType.Call) {
var call = (MethodCallExpression)expression;
if (call.Method.IsStatic && call.Method.DeclaringType == typeof(Queryable)) {
return call.Method.GetGenericMethodDefinition();
}
}
return null;
}
public static bool IsQueryableMethod(Expression expression, string method) {
return _methods.Where(m => m.Name == method).Contains(GetQueryableMethod(expression));
}
public static bool IsOrderingMethod(Expression expression) {
return _orderMethods.Any(method => IsQueryableMethod(expression, method));
}
}
}
|
