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我正在开发一个 windows phone 应用程序，我必须将图像转换为 base64 字符串，并且必须通过 Web 服务传递该字符串。所以我尝试了很多方法，但是每次我收到“目标调用错误”的错误时，我都无法发送它。使用此代码，我可以从库中选择图像，但无法通过 Web 服务发送。

我使用以下代码来转换图像：

private void photoChooserTask_Completed(object sender, PhotoResult e)
{
    BitmapImage image = new BitmapImage();
    image.SetSource(e.ChosenPhoto);
    this.imageTribute.Source = image;
    byte[] bytearray = null;
    using (MemoryStream ms = new MemoryStream())
    {

        if (imageTribute.Source == null)
        {

        }
        else
        {
            WriteableBitmap wbitmp = new WriteableBitmap((BitmapImage)imageTribute.Source);

            wbitmp.SaveJpeg(ms, 40, 40, 0, 82);
            bytearray = ms.ToArray();
        }
    }
    strimage = Convert.ToBase64String(bytearray);
}

所以请如果有人知道这件事，请帮助我。提前谢谢。

编辑

void uploadphoto()
{
WebClient webClient1 = new WebClient();
    webClient1.DownloadStringCompleted += new DownloadStringCompletedEventHandler(webClient1_DownloadStringCompleted);
webClient1.DownloadStringAsync(new Uri("Web Service"));
}
void webClient1_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
{
var rootobject1 = JsonConvert.DeserializeObject<RootObject1>(e.Result);
int error = rootobject1.response.errorFlag;
    string message = rootobject1.response.msg;
if (error == 0)
        {
                MessageBox.Show(message);
        }
    else
        {
                MessageBox.Show(message);
        }
}
public class Response1
{
public int errorFlag { get; set; }
    public string msg { get; set; }
    public List<string> uploadedImageNames { get; set; }
}
public class RootObject1
{
public Response1 response { get; set; }
}
private void ImageUpload(object sender, RoutedEventArgs e)
{
    //MessageBoxResult mb = MessageBox.Show("Select the mode of uploading the picture", "", MessageBoxButton.OKCancel);
    Popup popup = new Popup();
    photoSelection photo = new photoSelection();
    popup.Child = photo;
    popup.IsOpen = true;
    photo.camera.Click += (s, args) =>
        {
            photoCameraCapture.Show();
            popup.IsOpen = false;
        };
    photo.library.Click += (s, args) =>
        {
            photoChooserTask.Show();
            popup.IsOpen = false;
        };
}

编辑

堆栈跟踪

在这里，我上传了我的错误的堆栈跟踪。所以请检查并回复我。

4

2 回答 2

0

目标调用异常错误告诉您应用程序在调用可能是很多事情的方法时崩溃。真正的错误在于 InnerException。

查看 TargetInvocationException 对象的 InnerException 属性。这将显示堆栈跟踪和引发的实际错误。

于 2013-08-08T09:05:01.520 回答
-1

从资源或从isolatedStorage 将您的文件放入流中

//getting file from resource
var resource = Application.GetResourceStream(new Uri("image.jpg", UriKind.Relative));
//get Stream Data
StreamReader streamReader = new StreamReader(resource.Stream);
//initializing bytearray to stream length
byte[] imageData = new byte[streamReader.Length];
//wriing from stream to imagdata
streamReader.Read(imageData, 0, imageData.Length);
streamReader.Close();

使用 isolatedStorageFile 从隔离存储中读取图像数据，imageData并将其转换为 base64 使用：

var baseString = Convert.ToBase64String(imageData);
于 2013-08-09T07:13:34.323 回答