46 lines
1.6 KiB
C#
46 lines
1.6 KiB
C#
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//---------------------------------------------------------------------
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// <copyright file="ParameterRetriever.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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//
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// @owner [....]
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// @backupOwner [....]
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//---------------------------------------------------------------------
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using System;
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using System.Collections.Generic;
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using System.Globalization;
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using System.Data.Common;
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using System.Data.Metadata.Edm;
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using System.Linq;
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using System.Diagnostics;
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namespace System.Data.Common.CommandTrees.Internal
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{
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internal sealed class ParameterRetriever : BasicCommandTreeVisitor
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{
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private readonly Dictionary<string, DbParameterReferenceExpression> paramMappings = new Dictionary<string, DbParameterReferenceExpression>();
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private ParameterRetriever()
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{
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}
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internal static System.Collections.ObjectModel.ReadOnlyCollection<DbParameterReferenceExpression> GetParameters(DbCommandTree tree)
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{
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Debug.Assert(tree != null, "Ensure command tree is non-null before calling ParamterRetriever.GetParameters");
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ParameterRetriever retriever = new ParameterRetriever();
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retriever.VisitCommandTree(tree);
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return retriever.paramMappings.Values.ToList().AsReadOnly();
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}
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public override void Visit(DbParameterReferenceExpression expression)
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{
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Debug.Assert(expression != null, "Command tree subexpressions should never be null");
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this.paramMappings[expression.ParameterName] = expression;
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}
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}
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}
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