How Can I Elegantly Build Query Strings in C#?

Streamlining Query String Creation in C#

Constructing query strings for URLs is a frequent task in web development. Manual string manipulation is error-prone and cumbersome. This article explores cleaner, more efficient methods.

Leveraging HttpValueCollection

The HttpValueCollection class provides a structured approach. Add key-value pairs, and the ToString() method generates a URL-encoded query string:

<code class="language-csharp">NameValueCollection queryString = System.Web.HttpUtility.ParseQueryString(string.Empty);

queryString.Add("key1", "value1");
queryString.Add("key2", "value2");

string query = queryString.ToString();</code>

Utilizing Microsoft.AspNetCore.WebUtilities.QueryHelpers (for .NET Core)

In .NET Core applications, the QueryHelpers class offers a more concise solution:

<code class="language-csharp">Dictionary<string, string> parameters = new Dictionary<string, string>() { { "CIKey", "123456789" } };

Uri newUrl = new Uri(QueryHelpers.AddQueryString("https://customer-information.azure-api.net/customers/search/taxnbr", parameters));</code>

These methods offer significant improvements in code clarity and maintainability compared to manual string concatenation, reducing the risk of errors and improving overall development efficiency.

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