30 lines
1.2 KiB
C#
30 lines
1.2 KiB
C#
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using System.Linq;
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using System.Linq.Expressions;
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using System.Reflection;
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namespace System.Web.Util {
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internal static class QueryableUtility {
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private static readonly string[] _orderMethods = new[] { "OrderBy", "ThenBy", "OrderByDescending", "ThenByDescending" };
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private static readonly MethodInfo[] _methods = typeof(Queryable).GetMethods(BindingFlags.Public | BindingFlags.Static);
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private static MethodInfo GetQueryableMethod(Expression expression) {
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if (expression.NodeType == ExpressionType.Call) {
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var call = (MethodCallExpression)expression;
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if (call.Method.IsStatic && call.Method.DeclaringType == typeof(Queryable)) {
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return call.Method.GetGenericMethodDefinition();
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}
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}
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return null;
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}
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public static bool IsQueryableMethod(Expression expression, string method) {
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return _methods.Where(m => m.Name == method).Contains(GetQueryableMethod(expression));
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}
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public static bool IsOrderingMethod(Expression expression) {
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return _orderMethods.Any(method => IsQueryableMethod(expression, method));
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}
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}
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}
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