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string.Join('&', stringArgs)Size: a a a
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string.Join('&', stringArgs)ВК
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string queryString = string.Join('&', dictionary.Select(it => $"{it.Key}={it.Value}"));VL
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services.AddSingleton<T>(serviceProvider =>
{
var options = serviceProvider.GetRequiredService<IOptions<T2>>().Value;
...
});PD
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services.Configure<AppSettConnectionStrings>(Configuration.GetSection("ConnectionStrings"));
services.AddSingleton(provider =>
{
var options = provider.GetService<IOptions<AppSettConnectionStrings>>();
return options.Value;
});