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IItemContentGetReadStreamAsync Method (Int64, Int64, String, IDictionaryString, String, CancellationToken)

IT Hit WebDAV Classes Reference
Loads part of the content of the file from WebDAV server using eTag to ensure the content is up-to-date.

Namespace:  ITHit.WebDAV.Client
Assembly:  ITHit.WebDAV.Client (in ITHit.WebDAV.Client.dll) Version: 6.0.4052-Beta
Task<ContentStream> GetReadStreamAsync(
	long startIndex,
	long count,
	string eTag,
	IDictionary<string, string> headers = null,
	CancellationToken cancellationToken = null


Type: SystemInt64
Start position to retrieve count number of bytes from.
Type: SystemInt64
Number of bytes to retrieve.
Type: SystemString
The ETag that will be passed in the If-Range header.
headers (Optional)
Type: System.Collections.GenericIDictionaryString, String
Request headers.
cancellationToken (Optional)
Type: System.ThreadingCancellationToken
Propagates notification that operations should be canceled.

Return Value

Type: TaskContentStream
Stream to read file content.
NotFoundExceptionThis resource doesn't exist on the server.
WebDavHttpExceptionServer returned unknown error.
WebDavExceptionUnexpected error occurred.

Loads part of the content of the file from WebDAV server if it's content was not changed. If the content was modified the complete new content is returned.

This sample shows how to use the [!:GetReadStreamAsync(long,long,string)] method. First 1024 bytes of server file are already saved to local file. Code tries to download the rest of the file content.
string license = "<?xml version='1.0' encoding='utf...
WebDavSession session = new WebDavSession(license);
session.Credentials = new NetworkCredential("User1", "pwd");
IFolder folder = await session.GetFolderAsync(new Uri("https://server:8080/Sales"));
FileInfo file = new FileInfo("C:\\Temp\\Products.cff");
IFile file = await folder.GetResourceAsync(file.Name);

string etag = file.Etag;
int bufSize = 1048576; // 1Mb
byte[] buffer = new byte[bufSize];
int totalWritten = 10;

using (ContentStream stream = await file.GetReadStreamAsync(totalWritten, resource.ContentLength, etag, out contentModified))
    if (stream.ContentModified)
        totalWritten = 0; // entire file content is returned
    using (FileStream fs = file.OpenWrite())
        fs.Seek(totalWritten, SeekOrigin.Begin);
        int bytesRead;
        while ((bytesRead = (await stream.ReadAsync(buffer, 0, bufSize))) > 0)
            await fs.WriteAsync(buffer, 0, bytesRead);
See Also