EF Core 3.0翻译字符串。正确等于ordinalIgnoreCase

问题描述

在EF Core 3.0之前，此方法运行良好（在服务器+客户端上评估）：

Before EF Core 3.0 this worked fine (evaluated on server+client):

var exists = await _context.Countries.AsNoTracking().AnyAsync(x => x.CountryCode.Equals(country.CountryCode, StringComparison.OrdinalIgnoreCase));

翻译字符串的最佳/首选方法是什么？ ，StringComparison.OrdinalIgnoreCase）-现已在EF Core 3.0中提供，因此查询仅在服务器端进行评估。

What is the best/preferred method to translate the string.Equals(str, StringComparison.OrdinalIgnoreCase)-part now in EF Core 3.0, so that the query evaluates only on the server side.

var exists = await _context.Countries.AsNoTracking().AnyAsync(x => x.CountryCode.ToUpper() == country.CountryCode.ToUpper());

或

var exists = await _context.Countries.AsNoTracking().AnyAsync(x => x.CountryCode.ToLower() == country.CountryCode.ToLower());

或

var exists = await _context.Countries.AsNoTracking().AnyAsync(x => x.CountryCode.ToUpperInvariant() == country.CountryCode.ToUpperInvariant());

或

var exists = await _context.Countries.AsNoTracking().AnyAsync(x => x.CountryCode.ToLowerInvariant() == country.CountryCode.ToLowerInvariant());

还是其他？

推荐答案

您不应该这样做，也不要使用公认的答案方法，您应该只使用不带参数的String.Equals（）并在创建或迁移期间配置数据库排序规则。

You should not do that, nor use the accepted answer method, you should just use String.Equals() without parameters and configure your database collation, during creation or migration.

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