记C# HttpClient Post 使用

发表于

本文记录C# 使用HttpClient Post上传参数、文件的方法。

服务端传入参数是[FromForm]格式

WebAPI:

1
2
3
4
5
6
7
[HttpPost]
public IActionResult setlampSample([FromForm] string parStr,
[FromForm] int parA,
[FromForm] bool parB)
{
        return Ok(new { status = 0, msg = "OK" });
}

HttpClient:

1
2
3
4
5
6
7
8
9
10
11
static void Test1(string url)
{
    HttpClient httpClient = new HttpClient();
    var content = new FormUrlEncodedContent(new Dictionary<string, string>()
    {
        {"parStr", "aabbcc"},
        {"parA", "111"},
        {"parB", "True"},
    });
    var response = httpClient.PostAsync(url, content).Result;
}

服务端传入参数是Object

WebAPI:

1
2
3
4
5
[HttpPost]
public IActionResult setlampSampleB(demoModel obj)
{
    return Ok(new { status = 0, msg = "OK" });
}

HttpClient:

方法一：

1
2
3
4
5
6
7
static void Test2(string url)
{
    HttpClient httpClient = new HttpClient();
    StringContent content = new StringContent(JsonSerializer.Serialize(new demoModel() { parA = 123, parB = "456", parC = true }));
    content.Headers.ContentType = new MediaTypeHeaderValue("application/json");
    var response = httpClient.PostAsync(url, content).Result;
}

方法二：

1
2
3
4
5
static void Test3(string url)
{
    HttpClient httpClient = new HttpClient();
    var response = httpClient.PostAsJsonAsync(url, new demoModel() { parA = 789, parB = "321", parC = false }).Result;
}

HttpClient文件上传

WebAPI

1
2
3
4
5
6
7
8
[HttpPost]
[RequestSizeLimit(524288000)]
public async Task<IActionResult> Upload(IFormFile file)
{
    var files = Request.Form.Files;
    return Ok(new { status = 0, msg = "OK" });

}

HttpClient:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
static async Task Test4(string url,string filePath)
{
    using (var client = new HttpClient())
    {  
        client.Timeout = TimeSpan.FromSeconds(300);// 设置超时
        using (var content = new MultipartFormDataContent())
        {
            var fs = File.OpenRead(filePath);
            var streamContent = new StreamContent(fs);
            streamContent.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/octet-stream");

            
            content.Add(streamContent, "file", Path.GetFileName(filePath));// 添加文件到表单

            HttpResponseMessage response = await client.PostAsync(url, content);
            response.EnsureSuccessStatusCode();// 确保请求成功

            string responseBody = await response.Content.ReadAsStringAsync();
            Console.WriteLine(responseBody);
        }
    }
}

Demo

源码下载