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