C#发起Get、Post请求

C#发送 Get 请求，携带请求头，返回字符串数据

public static string Get(string url)
{
    //var token = GetTokent();
    using HttpClient client = new HttpClient();
    // 设置请求头
    client.DefaultRequestHeaders.TryAddWithoutValidation("Authorization", $"Bearer xxxxx");

    // 发送请求并获取响应
    var getTask = client.GetAsync(url);
    if (getTask.IsCanceled)
        throw getTask.Exception;
    if (getTask.IsFaulted)
        throw getTask.Exception;
    HttpResponseMessage getResponse = getTask.Result;
    getResponse.EnsureSuccessStatusCode();

    var result = getResponse.Content.ReadAsStringAsync().Result;
    // 返回想要的结果
    return result;
}

c#发起 Get 请求，返回二进制流，下载文件

public static void DownloadFile(string url, string savePath)
{
    using var httpClient = new HttpClient();
    httpClient.Timeout = TimeSpan.FromMinutes(2);
    // 设置请求头
    httpClient.DefaultRequestHeaders.TryAddWithoutValidation("Authorization", $"Bearer xxxxxx");
    httpClient.DefaultRequestHeaders.TryAddWithoutValidation("Content-Type", "application/json; charset=utf-8");

    // 发送Get请求
    var getTask = httpClient.GetAsync(url);
    if (getTask.IsCanceled)
        throw getTask.Exception;
    if (getTask.IsFaulted)
        throw getTask.Exception;
    HttpResponseMessage getResponse = getTask.Result;
    getResponse.EnsureSuccessStatusCode();
    // 接收二进制流，保存文件
    using var fs = new FileStream(savePath, FileMode.Create);
    var stram = getTask.Result.Content.ReadAsStreamAsync().Result;
    stram.CopyTo(fs);
}

C#发送 Post 请求，携带请求头、请求体

public static string Post(string url)
{
    using var client = new HttpClient();
    // 添加请求头
    //client.DefaultRequestHeaders.Add("Content-Type", "application/json; charset=utf-8"); // 这种方式添加请求头会报错
    client.DefaultRequestHeaders.TryAddWithoutValidation("Content-Type", "application/json; charset=utf-8");
    // 添加请求体
    var body = new Dictionary<string, string>()
        {
            { "app_id","xxxxx"},
            { "app_secret","xxxx"},
        };

    // 请求体数据（JSON格式）
    var content = new StringContent(JsonConvert.SerializeObject(body), Encoding.UTF8, "application/json");

    // 发送POST请求并获取响应
    var postTask = client.PostAsync(url, content);
    postTask.Wait();
    if (postTask.IsCanceled)
    {
        throw postTask.Exception;
    }
    if (postTask.IsFaulted)
    {
        throw postTask.Exception;
    }
    HttpResponseMessage postResponse = postTask.Result;
    HttpResponseMessage rest = postResponse.EnsureSuccessStatusCode();
    if (rest.IsSuccessStatusCode)
    {
        // 读取响应内容
        string responseBody = postResponse.Content.ReadAsStringAsync().Result;

        // 返回想要的数据
        return responseBody;
    }
    else
    {
        throw new Exception("Request failed with status code: " + postResponse.StatusCode);
    }
}