c# - 编写电子邮件时访问拒绝异常 Windows 8.1 C#

Question

private async Task<StorageFile> GetCsvFile()
        {
            var localFolder = KnownFolders.DocumentsLibrary;
            var file = await localFolder.CreateFileAsync("NRBcatalogue.csv", Windows.Storage.CreationCollisionOption.ReplaceExisting);

            String rk = "";
            for (int i = 0; i < k1.Count; i++)
            {
                rk += k1[i] + "\n";   
            }
            await Windows.Storage.FileIO.WriteTextAsync(file, rk);
            return file;
        }

        private async void AppBarButton_Click_1(object sender, RoutedEventArgs e)
        {
            EmailMessage email = new EmailMessage();
            email.To.Add(new EmailRecipient("brk27.007@gmail.com"));
            email.Subject = "NRB Catalogue";
            var file = await GetCsvFile(); //Error occured here
            email.Attachments.Add(new EmailAttachment(file.Name, file));
            await EmailManager.ShowComposeNewEmailAsync(email);
        }

The Error Details are: A first chance exception of type 'System.UnauthorizedAccessException' occurred in mscorlib.ni.dll. An exception of type 'System.UnauthorizedAccessException' occurred in mscorlib.ni.dll but was not handled in user code. Additional information: Access is denied. (Exception from HRESULT: 0x80070005 (E_ACCESSDENIED))

Answer 1

您正在尝试访问您没有权限的位置 var localFolder = KnownFolders.DocumentsLibrary;

这是有效的异常，因为您无法从 Windows Phone 应用程序访问 DocumentsLibrary 位置。此位置仅适用于 Windows 应用商店应用。您可以使用其他位置，但在使用之前请确保您已将此位置添加为应用程序 list 中的功能。供引用查询This Link .

因此必须选择您的应用可以访问的其他位置。例如 LocalFolder ， IsolatedStorage 等。对于 Localfolder 只需通过以下代码更改您的访问文件夹代码。

 var localFolder =  Windows.Storage.ApplicationData.Current.LocalFolder;

希望它能解决您的问题。干杯:)