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

question:

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

Answer:

some. Easily build query strings without manual operation:

// 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();

This will generate the following query string:

foo=bar&-baz&bar=bazinga

Or, leveraging the UriBuilder class provides a more comprehensive solution:

// 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();

This method generates the following URL:

http://example.com/?foo=bar&-baz&bar=bazinga

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