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51
src/EFCore.Relational/Query/Internal/QueryExpressionReplacingExpressionVisitor.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,51 @@ | ||
| // Licensed to the .NET Foundation under one or more agreements. | ||
| // The .NET Foundation licenses this file to you under the MIT license. | ||
|
|
||
| using System.Diagnostics.CodeAnalysis; | ||
| using System.Linq.Expressions; | ||
|
|
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| namespace Microsoft.EntityFrameworkCore.Query.Internal | ||
| { | ||
| /// <summary> | ||
| /// This is an internal API that supports the Entity Framework Core infrastructure and not subject to | ||
| /// the same compatibility standards as public APIs. It may be changed or removed without notice in | ||
| /// any release. You should only use it directly in your code with extreme caution and knowing that | ||
| /// doing so can result in application failures when updating to a new Entity Framework Core release. | ||
| /// </summary> | ||
| public class QueryExpressionReplacingExpressionVisitor : ExpressionVisitor | ||
| { | ||
| private readonly Expression _oldQuery; | ||
| private readonly Expression _newQuery; | ||
|
|
||
| /// <summary> | ||
| /// This is an internal API that supports the Entity Framework Core infrastructure and not subject to | ||
| /// the same compatibility standards as public APIs. It may be changed or removed without notice in | ||
| /// any release. You should only use it directly in your code with extreme caution and knowing that | ||
| /// doing so can result in application failures when updating to a new Entity Framework Core release. | ||
| /// </summary> | ||
| public QueryExpressionReplacingExpressionVisitor(Expression oldQuery, Expression newQuery) | ||
| { | ||
| _oldQuery = oldQuery; | ||
| _newQuery = newQuery; | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// This is an internal API that supports the Entity Framework Core infrastructure and not subject to | ||
| /// the same compatibility standards as public APIs. It may be changed or removed without notice in | ||
| /// any release. You should only use it directly in your code with extreme caution and knowing that | ||
| /// doing so can result in application failures when updating to a new Entity Framework Core release. | ||
| /// </summary> | ||
| [return: NotNullIfNotNull("expression")] | ||
| public override Expression? Visit(Expression? expression) | ||
| { | ||
| return expression is ProjectionBindingExpression projectionBindingExpression | ||
| && ReferenceEquals(projectionBindingExpression.QueryExpression, _oldQuery) | ||
| ? projectionBindingExpression.ProjectionMember != null | ||
| ? new ProjectionBindingExpression( | ||
| _newQuery, projectionBindingExpression.ProjectionMember!, projectionBindingExpression.Type) | ||
| : new ProjectionBindingExpression( | ||
| _newQuery, projectionBindingExpression.Index!.Value, projectionBindingExpression.Type) | ||
| : base.Visit(expression); | ||
| } | ||
| } | ||
| } |
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