通过 REST API 在 C# 中将图像上传到 ServiceNow

问题描述

我正在尝试使用此链接中提供的 SNow ServiceNow 将图像上传到 API 事件： https://developer.servicenow.com/dev.do#!/reference/api/orlando/rest/c_AttachmentAPI#r_AttachmentAPI-POSTmultipart

我在 C# 下面写了代码来发布图片：

    string url = "https://mycompany.service-Now.com/api/Now/attachment/upload/",userName = "MyUser",passwd = "MyPassword";

    var httpclienthandler = new httpclienthandler()
    {
        Credentials = new NetworkCredential(userName,passwd),};

    using (var httpClient = new HttpClient(httpclienthandler))
    {

        // Add an Accept header for JSON format.
        httpClient.DefaultRequestHeaders.Accept.Clear();
        httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

        var multipartContent = new MultipartFormDataContent();
        multipartContent.Headers.TryAddWithoutValidation("Content-Type","multipart/form-data");
        multipartContent.Add(new StringContent("incident"),"table_name");
        multipartContent.Add(new StringContent("f264fd3a1bghghgjjhg8f7b4bcbb6"),"table_sys_id"); // id of my incident
        multipartContent.Add(new ByteArrayContent(File.ReadAllBytes("D:\\MyImage.jpeg")),"uploadFile","MyImage.jpeg");

        var response = httpClient.PostAsync(new Uri(url),multipartContent).Result;
        string result = response.Content.ReadAsstringAsync().Result;
        MessageBox.Show(result);
    }

但是，我不断收到：

请求的URI不代表任何资源

可能是什么问题以及如何相应地调整代码？

解决方法

删除 url 末尾的“/”，并在标题中的键周围添加双引号后：

https://community.servicenow.com/community?id=community_question&sys_id=328614ffdb00eb808e7c2926ca9619ad&view_source=searchResult

最终的工作代码是：

string url = "https://mycompany.service-now.com/api/now/attachment/upload",userName = "MyUser",passwd = "MyPassword";

var httpClientHandler = new HttpClientHandler()
{
    Credentials = new NetworkCredential(userName,passwd),};

using (var httpClient = new HttpClient(httpClientHandler))
{

    // Add an Accept header for JSON format.
    httpClient.DefaultRequestHeaders.Accept.Clear();
    httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

    var fileStream = new ByteArrayContent(File.ReadAllBytes("D:\\Image.jpeg"));
            fileStream.Headers.Remove("Content-Type");
            fileStream.Headers.Add("Content-Type","application/octet-stream");
            fileStream.Headers.Add("Content-Transfer-Encoding","binary");
            fileStream.Headers.Add("Content-Disposition",$"form-data;name=\"uploadFile\"; filename=\"{"Image.jpeg"}\"");

            var multipartContent = new MultipartFormDataContent();
            multipartContent.Add(new StringContent("incident"),"\"table_name\"");
            multipartContent.Add(new StringContent("f264fd3a1bghghgjjhg8f7b4bcbb6"),"\"table_sys_id\"");
            multipartContent.Add(fileStream,"uploadFile");

    var response = httpClient.PostAsync(new Uri(url),multipartContent).Result;
    string result = response.Content.ReadAsStringAsync().Result;
    MessageBox.Show(result);
}