[英]upload image from virtual directory to server via web api 2.0
我有Web api,當客戶端是移動應用程序但Web客戶端不是asp.net Web時,我可以使用它向服務器上傳圖像。
我能夠將圖片保存到虛擬文件夾,但無法通過同時存儲Web /移動設備上傳圖片的Web API上傳。
我確定在asp.net中編寫客戶端代碼時出錯,或者無法處理正確的文件上傳控制回發,請在錯誤的地方指導我。
這是API-“ stackoverflow.com/a/35449422/8875271 ”; 我正在使用的我只希望使用圖像上傳控件的asp.net Web表單的客戶端代碼/示例,我對此感到厭倦,但這似乎無法正常工作,請幫助我。
移動和郵遞員上的API工作文件。
設計
<asp:UpdatePanel ID="filepanel" runat="server">
<ContentTemplate>
<asp:FileUpload ID="FileUpload1" runat="server" />
<asp:LinkButton ID="LinkButton1" runat="server" Text="Attach" OnClick="LinkButton1_Click"></asp:LinkButton>
</ContentTemplate>
<Triggers>
<asp:PostBackTrigger ControlID="LinkButton1" />
</Triggers>
</asp:UpdatePanel>
碼
protected void LinkButton1_Click(object sender, EventArgs e)
{
if (FileUpload1.HasFile)
{
System.Diagnostics.Debug.WriteLine(" uploaded");
APIs api = new APIs();
using (HttpClient client = new HttpClient())
{
try
{
string filename = FileUpload1.PostedFile.FileName;
Session["FileUpload1"] = filename;
FileUpload1.SaveAs(Server.MapPath("images\\" + FileUpload1.PostedFile.FileName));
using (var fileStream = File.Open(Server.MapPath("images\\" + Session["FileUpload1"].toString() ), FileMode.OpenOrCreate, FileAccess.Write, FileShare.Read))
{
System.Diagnostics.Debug.WriteLine("image file opened");
var content = new MultipartFormDataContent();
if(fileStream!=null)
content.Add(new StreamContent(fileStream));
var response = client.PostAsync(api.pictureUpload, content).Result; -------Line 174
if (response.IsSuccessStatusCode)
{
System.Diagnostics.Debug.WriteLine("File Uploaded Successfully");
}
else
{
System.Diagnostics.Debug.WriteLine("File Uploaded
UnSuccessfully"+response.RequestMessage);
}
}
}
catch (IOException iex)
{
System.Diagnostics.Debug.WriteLine("io exception:" + iex.ToString());
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine("image path:" + ex.ToString());
}
}
}
else
{
System.Diagnostics.Debug.WriteLine("no file");
}
}
錯誤
System.AggregateException: One or more errors occurred. --->
System.NotSupportedException: Stream does not support reading.
at System.IO.Stream.BeginReadInternal(Byte[] buffer, Int32 offset, Int32
count, AsyncCallback callback, Object state, Boolean serializeAsynchronously)
at System.IO.FileStream.BeginRead(Byte[] array, Int32 offset, Int32 numBytes,
AsyncCallback userCallback, Object stateObject)
at System.Net.Http.StreamToStreamCopy.StartRead()
--- End of inner exception stack trace ---
at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
at System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification)
at System.Threading.Tasks.Task`1.get_Result()
at TransferToMIR.LinkButton1_Click(Object sender, EventArgs e) in path\TransferToMIR.aspx.cs:line 174
---> (Inner Exception #0) System.NotSupportedException: Stream does not support reading.
at System.IO.Stream.BeginReadInternal(Byte[] buffer, Int32 offset, Int32 count, AsyncCallback callback, Object state, Boolean serializeAsynchronously)
at System.IO.FileStream.BeginRead(Byte[] array, Int32 offset, Int32 numBytes, AsyncCallback userCallback, Object stateObject)
at System.Net.Http.StreamToStreamCopy.StartRead()<---
這項更改使其有效
using (var fileStream = File.OpenRead(Server.MapPath("images\\" + Session["Filename"].toString())))
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