不支持给定路径格式（Visual Studio / Azure）？

Question

当我单击下载链接时，它会将我发送到尝试调试它的错误页面，它告诉我不支持我给定的路径格式

在我的控制器类中：

        public async Task<ActionResult> DownloadBlob(string file, string extension)
    {
        string downloadPath = await repo.DownloadBlobAsync(file, extension);
        return Json(downloadPath);
    }

在我的 Blob 存储类中：

        public async Task<string> DownloadBlobAsync (string file, string fileExtension)
    {
        _cloudBlobContainerx = _cloudBlobClientx.GetContainerReference(containerNamex);
        CloudBlockBlob blockBlob = _cloudBlobContainerx.GetBlockBlobReference(file + "." + fileExtension);

        var path = downloadPath + file + "." + fileExtension;
        using (var fileStream = System.IO.File.OpenWrite(path))
        {
            fileStream.Position = 1;
            //fileStream.Seek(0, SeekOrigin.Begin);

            await blockBlob.DownloadToStreamAsync(fileStream);

            return path;
        }
    }

说明：在执行当前 Web 请求期间发生未处理的异常。请查看堆栈跟踪以获取有关错误及其源自代码的位置的更多信息。

异常详细信息：System.NotSupportedException：不支持给定路径的格式

错误来源：

using (var fileStream = System.IO.File.OpenWrite(path))

Answer 1

根据您的描述，我建议您可以设置一个断点来检查downloadPath或'path'字段的值。

我创建了一个简单的演示来将 blob 文件下载到本地文件夹路径。它工作正常。可以参考一下。

string containerNamex = "container002";
string file = "MyTest"; //a blob file named MyTest.txt
string fileExtension = "txt";
string downloadPath = @"D:\MyBlob\";
CloudBlobClient  _cloudBlobClientx = storageAccount.CreateCloudBlobClient();
_cloudBlobContainerx = _cloudBlobClientx.GetContainerReference(containerNamex);
CloudBlockBlob blockBlob = _cloudBlobContainerx.GetBlockBlobReference(file + "." + fileExtension);
var path = downloadPath + file + "." + fileExtension;
using (var fileStream = System.IO.File.OpenWrite(path))
     {
          fileStream.Position = 1;
          blockBlob.DownloadToStreamAsync(fileStream);
          Console.WriteLine("success");
      }

结果如下：