silverlight - 非常简单的 Silverlight 文件上传示例

Question

很难说出这里问的是什么。这个问题模棱两可、含糊不清、不完整、过于宽泛或言辞激烈，无法以目前的形式合理回答。如需帮助澄清此问题以便可以重新打开，visit the help center .




8年前关闭。




我正在 Silverlight 中寻找一个非常示例的文件上传代码片段/解决方案。完成搜索后，我发现了许多控件/项目，但它们都非常复杂；支持多文件上传、文件上传进度、图片重采样等多种类。

我正在寻找具有简短、干净且易于理解的代码的最简单的场景。

Answer 1

这段代码很短并且(希望)易于理解:

public const int CHUNK_SIZE = 4096; 
public const string UPLOAD_URI = "http://localhost:55087/FileUpload.ashx?filename={0}&append={1}"; 
private Stream _data; 
private string _fileName; 
private long
_bytesTotal; 
private long _bytesUploaded;   
private void UploadFileChunk() 
{
    string uploadUri = ""; // Format the upload URI according to wether the it's the first chunk of the file
    if (_bytesUploaded == 0)
    {
        uploadUri = String.Format(UPLOAD_URI,_fileName,0); // Dont't append
    }
    else if (_bytesUploaded < _bytesTotal)
    {
        uploadUri = String.Format(UPLOAD_URI, _fileName, 1); // append
    }
    else
    {
        return;  // Upload finished
    }

    byte[] fileContent = new byte[CHUNK_SIZE];
    _data.Read(fileContent, 0, CHUNK_SIZE);

    WebClient wc = new WebClient();
    wc.OpenWriteCompleted += new OpenWriteCompletedEventHandler(wc_OpenWriteCompleted);
    Uri u = new Uri(uploadUri);
    wc.OpenWriteAsync(u, null, fileContent);
    _bytesUploaded += fileContent.Length; 
}   

void wc_OpenWriteCompleted(object sender, OpenWriteCompletedEventArgs e) 
{
    if (e.Error == null)
    {   
        object[] objArr = e.UserState as object[];
        byte[] fileContent = objArr[0] as byte[];
        int bytesRead = Convert.ToInt32(objArr[1]);
        Stream outputStream = e.Result;
        outputStream.Write(fileContent, 0, bytesRead);
        outputStream.Close();
        if (_bytesUploaded < _bytesTotal)
        {
            UploadFileChunk();
        }
        else
        {
            // Upload complete
        }
    } 
}

有关完整的可下载解决方案，请参阅我的博客文章: File Upload in Silverlight - a Simple Solution