Csharp 在 C# 中使用 CopyTo() 后丢失原始流

我的C#项目用于执行两个操作:

1. 下载SharePoint文件并
2. 通过将下载的流保存到Azure BLOB中来存储该文件.

我最近得到了一个要求，要求在第一步和第二步之间再增加一个步骤. 它是将此流的副本保存为本地文件夹中的文件，然后将其保存到Azure Blob. 当我使用stream Object.CopyTo(LocalFileLocation)将该流复制到本地时，源流将变为空白，BLOB文件的大小变为0.

string content = string.Empty;
var stream = await this.DownloadFromSPO(pipeline).ConfigureAwait(false);
if (stream == null)
{                
    return false;
}
    
// saving stream as file into local folder
                
string filePath2 = Path.Combine("C:\\localLocation", pipeline.Name);
                
using (StreamReader reader = new StreamReader(stream))
{      
    content = reader.ReadToEnd();         
    FileStream outputFileStream = new FileStream(filePath2, FileMode.Create);
    stream.Position = 0;                
    stream.CopyTo(outputFileStream);
}          
    
                
stream = helper.GetStream(content);
// Upload the file to BLOB Storage using drive item id as the blob file name
CloudBlob blob = null;
await AzureRetryHelper.OperationWithBasicRetryAsync(async () =>
{
    blob = await this.blobHelper.UploadFileToBlob(
        stream,
        this.config.GetConfigValue(Constants.DataContainerName),
        pipeline.BlobNativeFilePath,
        true,
        pipeline.MimeType).ConfigureAwait(false);
}).ConfigureAwait(false);

这就是我try 添加以下代码的原因:

stream = helper.GetStream(content); // to take the stream back and 

然后将其保存到BLOB存储.

这里的GetStream函数具有以下代码:

public static Stream GetStream(string fileContent)
{
    MemoryStream ms = new MemoryStream();
    StreamWriter writer = new StreamWriter(ms);
    writer.WriteLine(fileContent);
    writer.Flush();

    // Rewind the MemoryStream before copying
    ms.Seek(0, SeekOrigin.Begin);
    return ms;
}

在这之后，我被保存的BLOB文件损坏了.

对此有什么帮助吗？