Question

我正在Silverlight中寻找一个非常示例的文件上传代码snipplet /解决方案。完成搜索后，我发现了许多控制/项目，但所有这些都非常复杂;支持多文件上传，文件上传进度，图像重新采样和许多类。

我正在寻找最简单的方案，包括简短，干净且易于理解的代码。

Answer 1

这段代码很简短（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，请参阅我的博文：File Upload in Silverlight - a Simple Solution

Answer 2

查看此项目http://simpleuploader.codeplex.com/。它允许您使用非常少的代码行将多个文件上传到您的服务器。

Answer 3

请参阅这篇文章。本文介绍如何使用非常简单的UI上传单个文件并对每个步骤进行说明。 http://aspilham.blogspot.com/2010/04/file-upload-in-chunks-using-silverlight.html

非常简单的Silverlight文件上传示例

3 个答案: