检查记录是否存在返回“序列包含多个匹配元素”。 对于带有实体框架 5 的 Net5

Question

I have an .Net5 solution using Entity Framework 5.0.0. Im able to save data to the Backend SQL DB and all is well. But when I try to check is a record exist using the statement below im getting an error " Sequence contains more than one matching element. "

 var status = await dbContext.Item.AnyAsync(x => x.Name == "Bread")

I'm not sure what's causing this. Any help appreciated

Im using the following packages

    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="5.0.0" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="5.0.0">
 <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="5.0.0">

Answer 1

This is not an error that should come back from AnyAsync . I suspect there is something in the structure of your items (eg via a foreign key) that is generating the error. Use ToTraceString() to find out the underlying SQL query.

Answer 2

I solved it by updating all my EntityFramework related packages to

<PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="5.0.17" />
<PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="5.0.17">
<PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="5.0.17">