EF Core 3.1.x : The LINQ expression could not be translated. Either rewrite the query in a form that can be translated

Question

EF Core 3.1.x:

I would not like to load all products in memory, which below queries do! Guess what happen if i do have millions of products in table?

var products = context.Products.ToList();
products = products.Where(p => p.Name.Contains("xxx")).ToList();

And below query throws The LINQ expression 'DbSet-Product- .Where(b => b.Name.Contains( value: "xxx", comparisonType: InvariantCultureIgnoreCase))' could not be translated. Either rewrite the query in a form that can be translated, or switch to client evaluation explicitly by inserting a call to either AsEnumerable(), AsAsyncEnumerable(), ToList(), or ToListAsync().

var products = context.Products.Where(p => p.Name.Contains("xxx", StringComparison.InvariantCultureIgnoreCase)).ToList();

Related Issue on github: #19087

Can anyone help me out. how to filter data with server side evaluation with ef core 3.1.x?

Answer 1

EF Core 确实为服务器端评估翻译 Contains - 但不是接受 StringComparison.InvariantCultureIgnoreCase（或任何其他 StringComparison）的重载。

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