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51 lines
1.8 KiB
C#
51 lines
1.8 KiB
C#
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// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
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namespace System.Data.Entity.Infrastructure
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{
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using System.Data.Entity.Internal;
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using System.Data.Entity.Utilities;
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/// <summary>
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/// Represents an entity used to store metadata about an EDM in the database.
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/// </summary>
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[Obsolete(
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"EdmMetadata is no longer used. The Code First Migrations <see cref=\"EdmModelDiffer\" /> is used instead.")]
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public class EdmMetadata
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{
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#region Entity properties
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/// <summary>
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/// Gets or sets the ID of the metadata entity, which is currently always 1.
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/// </summary>
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/// <value> The id. </value>
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public int Id { get; set; }
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/// <summary>
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/// Gets or sets the model hash which is used to check whether the model has
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/// changed since the database was created from it.
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/// </summary>
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/// <value> The model hash. </value>
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public string ModelHash { get; set; }
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#endregion
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#region Helper method for getting model hash
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/// <summary>
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/// Attempts to get the model hash calculated by Code First for the given context.
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/// This method will return null if the context is not being used in Code First mode.
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/// </summary>
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/// <param name="context"> The context. </param>
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/// <returns> The hash string. </returns>
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public static string TryGetModelHash(DbContext context)
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{
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Check.NotNull(context, "context");
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var compiledModel = context.InternalContext.CodeFirstModel;
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return compiledModel == null ? null : new ModelHashCalculator().Calculate(compiledModel);
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}
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#endregion
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}
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}
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