c# - .NET HttpClient 向 POST 添加查询字符串和 JSON 正文

Question

如何设置 .NET HttpClient.SendAsync() 请求以包含查询字符串参数和 JSON 正文(在 POST 的情况下)？

// Query string parameters
var queryString = new Dictionary<string, string>()
{
    { "foo", "bar" }
};

// Create json for body
var content = new JObject(json);

// Create HttpClient
var client = new HttpClient();
client.BaseAddress = new Uri("https://api.baseaddress.com/");

var request = new HttpRequestMessage(HttpMethod.Post, "something");
// Setup header(s)
request.Headers.Add("Accept", "application/json");
// Add body content
request.Content = new StringContent(
    content.ToString(),
    Encoding.UTF8,
    "application/json"
);

// How do I add the queryString?

// Send the request
client.SendAsync(request);

我见过的每个例子都说要设置

request.Content = new FormUrlEncodedContent(queryString)

但随后我在 request.Content

中丢失了我的 JSON 主体初始化

Answer 1

我最终找到了我需要的 Microsoft.AspNetCore.WebUtilities.QueryHelpers.AddQueryString()。这使我能够添加查询字符串参数，而无需手动构建字符串(并担心转义字符等)。

注意:我使用的是 ASP.NET Core，但同样的方法也可以通过 Microsoft.Owin.Infrastructure.WebUtilities.AddQueryString()

获得

新代码:

// Query string parameters
var queryString = new Dictionary<string, string>()
{
    { "foo", "bar" }
};

// Create json for body
var content = new JObject(json);

// Create HttpClient
var client = new HttpClient();
client.BaseAddress = new Uri("https://api.baseaddress.com/");

// This is the missing piece
var requestUri = QueryHelpers.AddQueryString("something", queryString);

var request = new HttpRequestMessage(HttpMethod.Post, requestUri);
// Setup header(s)
request.Headers.Add("Accept", "application/json");
// Add body content
request.Content = new StringContent(
    content.ToString(),
    Encoding.UTF8,
    "application/json"
);

// Send the request
client.SendAsync(request);