.Net Core 当中的HttpClient POST表单提交

原创已于 2023-11-29 13:11:00 修改 · 2.4k 阅读

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于 2021-10-10 15:36:09 首次发布

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本文介绍了三种HTTP请求数据提交的方式：1) 使用POST方式附带URL字符串；2) 将JSON数据写入请求体，设置Content-Type为'application/json'；3) 以form方式提交数据，Content-Type为'application/x-www-form-urlencoded'。示例代码展示了如何使用HttpClient在C#中实现这些方法。

Post方式提交数据

string postUrl = "{\"PrintLog\":\"\",\"ModelName\":\"" + itemEntiy.ModelCode + "\",\"ProcessName\":\"" + itemEntiy.ProcessCode + "\"}";
using (HttpClient httpClient = new HttpClient())
{
    //multipart/form-data方式
    var content = new MultipartFormDataContent(DateTime.Now.Ticks.ToString("X"));
    content.Add(new StringContent(postUrl), "queryJson");
    var result = await httpClient.PostAsync("http://xxxx/CollectVariable?DataType=CollectVariableData", content);
    string responseString = result.Content.ReadAsStringAsync().Result;
    if (logger != null)
        logger.LogInformation("Response status:{0}", result.StatusCode);
}

第2中方式：JSON参数写入body  applition/json
 using (HttpClient httpClient = sender.HttpClientFactory.CreateClient())
{
    //var content = new MultipartFormDataContent(DateTime.Now.Ticks.ToString("X"));
    //content.Add(new StringContent(postJson));

    var buffer = Encoding.UTF8.GetBytes(postJson);
    var byteContent = new ByteArrayContent(buffer);
    byteContent.Headers.ContentType = new MediaTypeHeaderValue("application/json");
    var requestMsg = await httpClient.PostAsync(auditurl, byteContent);
    string auditjson = await requestMsg.Content.ReadAsStringAsync();
}
第三中方式：参数写入form application/x-www-form-urlencoded
则使用FormUrlEncodedContent

Get方式提交数据

using (HttpClient httpClient = new HttpClient())
{
    var result = await httpClient.GetAsync("http://xxxx/CollectVariable?DataType=CollectVariableData?...");
    string responseString = result.Content.ReadAsStringAsync().Result;
    if (logger != null)
        logger.LogInformation("Response status:{0}", result.StatusCode);
}