我们正在将.NET Rally代码从SOAP移植到REST .NET API。到目前为止，REST API似乎更快，更易于使用，因为每次工作产品自定义字段在Rally工作区中更改时都没有WSDL中断。
我在尝试复制上传附件的能力时遇到了一件事情。我们遵循与此帖中概述的程序非常相似的程序：
Rally SOAP API - How do I add an attachment to a Hierarchical Requirement
将图像读入System.Drawing.Image。我们使用ImageToByteArray函数将图像转换为字节数组，然后将其分配给首先创建的AttachmentContent。
然后，创建附件，并连接到AttachmentContent和HierarchicalRequirement。
所有创作活动都很有效。内容对象被创建得很好。然后创建名为“Image.png”的新附件并将其链接到Story。但是当我从Rally下载结果附件时，Image.png只有零字节！我用不同的图像，JPEG，PNG等尝试了这一点，结果相同。
下面列出了显示我们流程的代码摘录。有什么明显的东西让我失踪吗？提前谢谢。
// .... Read content into a System.Drawing.Image called imageObject ....
// Convert Image to byte array
byte[] imageBytes = ImageToByteArray(imageObject, System.Drawing.Imaging.ImageFormat.Png);
var imageLength = imageBytes.Length;
// AttachmentContent
DynamicJsonObject attachmentContent = new DynamicJsonObject();
attachmentContent["Content"] = imageBytes ;
CreateResult cr = restApi.Create("AttachmentContent", myAttachmentContent);
String contentRef = cr.Reference;
Console.WriteLine("Created: " + contentRef);
// Set up attachment
DynamicJsonObject newAttachment = new DynamicJsonObject();
newAttachment["Artifact"] = story;
newAttachment["Content"] = attachmentContent;
newAttachment["Name"] = "Image.png";
newAttachment["ContentType"] = "image/png";
newAttachment["Size"] = imageLength;
newAttachment["User"] = user;
// Create the attachment in Rally
cr = restApi.Create("Attachment", newAttachment);
String attachRef = cr.Reference;
Console.WriteLine("Created: " + attachRef);
}
public static byte[] ImageToByteArray(Image image, System.Drawing.Imaging.ImageFormat format)
{
using (MemoryStream ms = new MemoryStream())
{
image.Save(ms, format);
// Convert Image to byte[]
byte[] imageBytes = ms.ToArray();
return imageBytes;
}
}
答案 0 :(得分：4)
这个问题也让我困惑了一段时间 - 最终在大约一周前将其整理出来。
两个观察结果：
我要包含一个代码示例来说明：
// System Libraries
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Drawing.Imaging;
using System.Drawing;
using System.IO;
using System.Web;
// Rally REST API Libraries
using Rally.RestApi;
using Rally.RestApi.Response;
namespace RestExample_CreateAttachment
{
class Program
{
static void Main(string[] args)
{
// Set user parameters
String userName = "user@company.com";
String userPassword = "password";
// Set Rally parameters
String rallyURL = "https://rally1.rallydev.com";
String rallyWSAPIVersion = "1.36";
//Initialize the REST API
RallyRestApi restApi;
restApi = new RallyRestApi(userName,
userPassword,
rallyURL,
rallyWSAPIVersion);
// Create Request for User
Request userRequest = new Request("user");
userRequest.Fetch = new List<string>()
{
"UserName",
"Subscription",
"DisplayName",
};
// Add a Query to the Request
userRequest.Query = new Query("UserName",Query.Operator.Equals,userName);
// Query Rally
QueryResult queryUserResults = restApi.Query(userRequest);
// Grab resulting User object and Ref
DynamicJsonObject myUser = new DynamicJsonObject();
myUser = queryUserResults.Results.First();
String myUserRef = myUser["_ref"];
//Set our Workspace and Project scopings
String workspaceRef = "/workspace/12345678910";
String projectRef = "/project/12345678911";
bool projectScopingUp = false;
bool projectScopingDown = true;
// Find User Story that we want to add attachment to
// Tee up Story Request
Request storyRequest = new Request("hierarchicalrequirement");
storyRequest.Workspace = workspaceRef;
storyRequest.Project = projectRef;
storyRequest.ProjectScopeDown = projectScopingDown;
storyRequest.ProjectScopeUp = projectScopingUp;
// Fields to Fetch
storyRequest.Fetch = new List<string>()
{
"Name",
"FormattedID"
};
// Add a query
storyRequest.Query = new Query("FormattedID", Query.Operator.Equals, "US43");
// Query Rally for the Story
QueryResult queryResult = restApi.Query(storyRequest);
// Pull reference off of Story fetch
var storyObject = queryResult.Results.First();
String storyReference = storyObject["_ref"];
// Read In Image Content
String imageFilePath = "C:\\Users\\username\\";
String imageFileName = "image1.png";
String fullImageFile = imageFilePath + imageFileName;
Image myImage = Image.FromFile(fullImageFile);
// Get length from Image.Length attribute - don't use this in REST though
// REST expects the length of the image in number of bytes as converted to a byte array
var imageFileLength = new FileInfo(fullImageFile).Length;
Console.WriteLine("Image File Length from System.Drawing.Image: " + imageFileLength);
// Convert Image to Base64 format
string imageBase64String = ImageToBase64(myImage, System.Drawing.Imaging.ImageFormat.Png);
// Length calculated from Base64String converted back
var imageNumberBytes = Convert.FromBase64String(imageBase64String).Length;
// This differs from just the Length of the Base 64 String!
Console.WriteLine("Image File Length from Convert.FromBase64String: " + imageNumberBytes);
// DynamicJSONObject for AttachmentContent
DynamicJsonObject myAttachmentContent = new DynamicJsonObject();
myAttachmentContent["Content"] = imageBase64String;
try
{
CreateResult myAttachmentContentCreateResult = restApi.Create("AttachmentContent", myAttachmentContent);
String myAttachmentContentRef = myAttachmentContentCreateResult.Reference;
Console.WriteLine("Created: " + myAttachmentContentRef);
// DynamicJSONObject for Attachment Container
DynamicJsonObject myAttachment = new DynamicJsonObject();
myAttachment["Artifact"] = storyReference;
myAttachment["Content"] = myAttachmentContentRef;
myAttachment["Name"] = "AttachmentFromREST.png";
myAttachment["Description"] = "Attachment Desc";
myAttachment["ContentType"] = "image/png";
myAttachment["Size"] = imageNumberBytes;
myAttachment["User"] = myUserRef;
CreateResult myAttachmentCreateResult = restApi.Create("Attachment", myAttachment);
List<string> createErrors = myAttachmentContentCreateResult.Errors;
for (int i = 0; i < createErrors.Count; i++)
{
Console.WriteLine(createErrors[i]);
}
String myAttachmentRef = myAttachmentCreateResult.Reference;
Console.WriteLine("Created: " + myAttachmentRef);
}
catch (Exception e)
{
Console.WriteLine("Unhandled exception occurred: " + e.StackTrace);
Console.WriteLine(e.Message);
}
}
// Converts image to Base 64 Encoded string
public static string ImageToBase64(Image image, System.Drawing.Imaging.ImageFormat format)
{
using (MemoryStream ms = new MemoryStream())
{
image.Save(ms, format);
// Convert Image to byte[]
byte[] imageBytes = ms.ToArray();
// Convert byte[] to Base64 String
string base64String = Convert.ToBase64String(imageBytes);
return base64String;
}
}
}
}