using System;
using System.Collections.Generic;
using System.Text;
using System.Reflection;
using System.Linq.Expressions;
namespace System.Data.Linq {
/// <summary>
/// Encodes the rules for subqueries.
/// </summary>
static class SubqueryRules {
/// <summary>
/// This list of top-level methods that are supported in subqueries.
/// </summary>
/// <param name="mi"></param>
/// <returns></returns>
static internal bool IsSupportedTopLevelMethod(MethodInfo mi) {
if (!IsSequenceOperatorCall(mi))
return false;
switch (mi.Name) {
case "Where":
case "OrderBy":
case "OrderByDescending":
case "ThenBy":
case "ThenByDescending":
case "Take":
return true;
}
return false;
}
private static bool IsSequenceOperatorCall(MethodInfo mi) {
Type declType = mi.DeclaringType;
if (declType == typeof(System.Linq.Enumerable) ||
declType == typeof(System.Linq.Queryable)) {
return true;
}
return false;
}
}
}
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