How Can I Easily Build Query Strings for System.Net.HttpClient GET Requests?

Query string construction method for System.Net.HttpClient GET request

Question:

System.Net.HttpClient lacks API to directly add GET request parameters. Is there an easier way to build query strings without manually creating name-value collections, URL encoding, and concatenation?

Answer:

Yes. Easily build query strings with no manual effort:

<code class="language-csharp">// 解析空查询字符串
var query = HttpUtility.ParseQueryString(string.Empty);

// 添加参数
query["foo"] = "bar&-baz";
query["bar"] = "bazinga";

// 将查询转换为字符串
string queryString = query.ToString();</code>

This will generate the following query string:

<code>foo=bar%3c%3e%26-baz&bar=bazinga</code>

Alternatively, utilizing the UriBuilder class provides a more comprehensive solution:

<code class="language-csharp">// 为目标URL创建一个UriBuilder
var builder = new UriBuilder("http://example.com");
builder.Port = -1;

// 解析查询字符串
var query = HttpUtility.ParseQueryString(builder.Query);

// 添加参数
query["foo"] = "bar&-baz";
query["bar"] = "bazinga";

// 更新UriBuilder的查询字符串
builder.Query = query.ToString();

// 获取完整的URL
string url = builder.ToString();</code>

This method generates the following URL:

<code>http://example.com/?foo=bar%3c%3e%26-baz&bar=bazinga</code>

You can seamlessly integrate this URL into the GetAsync method of System.Net.HttpClient to perform a GET request with the required query parameters.

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