Question

我想通过WCF服务将图像从WP页面上传到数据库。我有以下服务实现编译好：

public bool Upload(Stuff picture)
    {
        FileStream fileStream = null;
        BinaryWriter writer = null;
        string filePath;
        try
        {
            filePath = HttpContext.Current.Server.MapPath(".") +
                       ConfigurationManager.AppSettings["PictureUploadDirectory"] +
                       picture.stuffName; 

            if (picture.stuffName != string.Empty)
            {
                fileStream = File.Open(filePath, FileMode.Create);
                writer = new BinaryWriter(fileStream); 
                writer.Write(picture.stuffPhoto);
            }
            return true;
        }
        catch (Exception)
        {
            return false;
        }
        finally
        {
            if (fileStream != null)
                fileStream.Close();
            if (writer != null)
                writer.Close();
        }
    }

但在WP页面上我有错误。我正在学习本教程：http://www.silverlightshow.net/items/Uploading-and-downloading-images-from-WCF-in-Silverlight.aspx这是我的代码：

private void uploadBtn_Click(object sender, RoutedEventArgs e)
    {
        OpenFileDialog openFileDialog = new OpenFileDialog(); // error 1,2 
        openFileDialog.Filter = "JPEG files|*.jpg";
        if (openFileDialog.ShowDialog() == true)
        {
            Stream stream = (Stream)openFileDialog.File.OpenRead();
            byte[] bytes = new byte[stream.Length];
            stream.Read(bytes, 0, (int)stream.Length);

            string fileName = openFileDialog.File.Name;
            ServiceReference1.Stuff pictureFile = new ServiceReference1.Stuff();
            ServiceReference1.Stuff.stuffName = fileName; //error 3,4
            ServiceReference1.Stuff.stuffPhoto = bytes;

            ServiceReference1.Service1Client client = new ServiceReference1.Service1Client();
            client.UploadCompleted += new EventHandler
           <System.ComponentModel.AsyncCompletedEventArgs>(client_UploadCompleted); // error 5
            client.UploadAsync(pictureFile);
        }      
    }
    void client_UploadCompleted(object sender, System.ComponentModel.AsyncCompletedEventArgs e)
    {
        if (e.Error == null)
        {
            if (e.Result) // error 6
            {
                ResultTextlock.Text = "Upload succeeded :)";
            }
            else
            {
                ResultTextBlock.Text = "Upload failed :(";
            }
        }
    }

错误是：

1,2）无法找到类型或命名空间名称'OpenFileDialog'（您是否缺少using指令或程序集引用？）。

3,4）非静态字段，方法或属性'PhoneApp1.ServiceReference1.Stuff.stuffName.get'

需要对象引用

5）无法将类型'System.EventHandler'隐式转换为'System.EventHandler'

6）'System.ComponentModel.AsyncCompletedEventArgs'不包含'Result'的定义，并且没有扩展方法'Result'可以找到接受类型'System.ComponentModel.AsyncCompletedEventArgs'的第一个参数（你是否错过了使用指令或程序集引用？）

7）名称空间'System.Windows'中不存在类型或命名空间名称'Forms'（您是否缺少程序集引用？）（我有tis语句：使用System.Windows.Forms;）`

Answer 1

Windows Phone没有OpenFileDialog，您必须使用Photo Chooser task

您正在引用ServiceReference1.Stuff作为静态对象。我认为你的意思是pictureFile.stuffName等。

事件的类型错误，如错误消息所示。

Windows Phone没有Windows窗体可用。

您无法将代码从Silverlight复制/粘贴到Windows Phone并假设它有效。您必须学习如何使用WP。这些也是错误消息中清楚解释的基本错误。我建议了解基础知识。

从WP 8页面将图像上传到数据库。

1 个答案: