c# - UriFormatException：无效的 URI：无法解析主机名。MVC API C#

Question

我正在尝试创建我的 Web 应用程序并且我想连接到 API。我的Startup.cs文件中有基地址：

services.AddHttpClient("API Client", client =>
{
    client.BaseAddress = new Uri("https://icanhazdadjoke.com/");
    client.DefaultRequestHeaders.Add("Accept", "application/json");
});

但是现在我想通过/search在 url 地址中添加一个来更改它。我正在使用UriBuilder，它看起来像这样：

string responseBody = "";
var client = _httpClientFactory.CreateClient("API Client");
var builder = new UriBuilder(client.GetAsync("") + "/search");
var query = HttpUtility.ParseQueryString(builder.Query);
query.Add("term", searchedTerm);
query.Add("limit", jokesPerPage);

builder.Query = query.ToString();
string url = builder.ToString();
responseBody = await client.GetStringAsync(url);
return JsonConvert.DeserializeObject<JokeModel>(responseBody);

我收到一个错误：

UriFormatException：无效的 URI：无法解析主机名。

我怎样才能解决这个问题？

Answer 1

GetAsync执行 GET 请求，而您可能想使用客户端BaseAddress作为初始 Uri 来构造：

var builder = new UriBuilder(client.BaseAddress);
builder.Path = "/search";
var query = HttpUtility.ParseQueryString(builder.Query);
query.Add("term", searchedTerm);
query.Add("limit", jokesPerPage);

builder.Query = query.ToString();
string url = builder.ToString();