问题描述
我已经将 EntityFramework 6 的项目实现到 EntityFramework Core 3.1 中。在 EF6 中,我们使用 HasColumnAnnotation() 方法在模型中为用于存储属性的数据库列设置注释。
使用 Roslyn API,我已经用于迁移所有属性。 下面的例子是将 HasColumnAnnotation 迁移到 HasIndex。
示例.cs:
private void CreateCompositeUnique(DbModelBuilder modelBuilder)
{
modelBuilder
.Entity<Web>()
.Property(x=>x.Url)
.HasColumnAnnotation(IndexAnnotation.AnnotationName,new IndexAnnotation(new IndexAttribute("IX_Url") { IsUnique = true }));
}
HasIndex 表达式语句:
SyntaxFactory.ExpressionStatement(
SyntaxFactory.InvocationExpression(
SyntaxFactory.MemberAccessExpression(
SyntaxKind.SimpleMemberAccessExpression,SyntaxFactory.IdentifierName(
SyntaxFactory.MissingToken(SyntaxKind.IdentifierToken)),SyntaxFactory.IdentifierName("HasIndex")))
.WithArgumentList(
SyntaxFactory.ArgumentList(
SyntaxFactory.SingletonSeparatedList<ArgumentSyntax>(
SyntaxFactory.Argument(
SyntaxFactory.SimpleLambdaExpression(
SyntaxFactory.Parameter(
SyntaxFactory.Identifier("x")))
.WithExpressionBody(
SyntaxFactory.MemberAccessExpression(
SyntaxKind.SimpleMemberAccessExpression,SyntaxFactory.IdentifierName("x"),SyntaxFactory.IdentifierName("Url"))))))))
.normalizeWhitespace()
IsUnique ExpressionStatement:
SyntaxFactory.ExpressionStatement(
SyntaxFactory.InvocationExpression(
SyntaxFactory.MemberAccessExpression(
SyntaxKind.SimpleMemberAccessExpression,SyntaxFactory.IdentifierName("IsUnique")))
.WithArgumentList(
SyntaxFactory.ArgumentList(
SyntaxFactory.SingletonSeparatedList<ArgumentSyntax>(
SyntaxFactory.Argument(
SyntaxFactory.LiteralExpression(
SyntaxKind.TrueLiteralExpression))))))
.normalizeWhitespace()
我必须像这样使用 Roslyn API 将 IsUnique-ExpressionStatement 插入/合并到现有的 HasIndex-ExpressionStatement 中
输出:
SyntaxFactory.ExpressionStatement(
SyntaxFactory.InvocationExpression(
SyntaxFactory.MemberAccessExpression(
SyntaxKind.SimpleMemberAccessExpression,SyntaxFactory.InvocationExpression(
SyntaxFactory.MemberAccessExpression(
SyntaxKind.SimpleMemberAccessExpression,SyntaxFactory.IdentifierName(
SyntaxFactory.MissingToken(SyntaxKind.IdentifierToken)),SyntaxFactory.IdentifierName("HasIndex")))
.WithArgumentList(
SyntaxFactory.ArgumentList(
SyntaxFactory.SingletonSeparatedList<ArgumentSyntax>(
SyntaxFactory.Argument(
SyntaxFactory.SimpleLambdaExpression(
SyntaxFactory.Parameter(
SyntaxFactory.Identifier("x")))
.WithExpressionBody(
SyntaxFactory.MemberAccessExpression(
SyntaxKind.SimpleMemberAccessExpression,SyntaxFactory.IdentifierName("Url"))))))),SyntaxFactory.IdentifierName("IsUnique")))
.WithArgumentList(
SyntaxFactory.ArgumentList(
SyntaxFactory.SingletonSeparatedList<ArgumentSyntax>(
SyntaxFactory.Argument(
SyntaxFactory.LiteralExpression(
SyntaxKind.TrueLiteralExpression))))))
.normalizeWhitespace()
如何在 Roslyn 中做到这一点?
解决方法
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