ReadToEndAsync Method

StreamReader.ReadToEndAsync Method ()

.NET Framework 4.6 and 4.5

Reads all characters from the current position to the end of the stream asynchronously and returns them as one string.

Namespace:   System.IO
Assembly:  mscorlib (in mscorlib.dll)

[HostProtectionAttribute(SecurityAction.LinkDemand, ExternalThreading = true)]
public override Task<string> ReadToEndAsync()

Return Value

Type: System.Threading.Tasks.Task<String>

A task that represents the asynchronous read operation. The value of the TResult parameter contains a string with the characters from the current position to the end of the stream.

Exception Condition

The number of characters is larger than MaxValue.


The stream has been disposed.


The reader is currently in use by a previous read operation.

The following example shows how to read the contents of a file by using the ReadToEndAsync() method.

using System;
using System.IO;

namespace ConsoleApplication
    class Program
        static void Main(string[] args)

        static async void ReadCharacters()
            String result;
            using (StreamReader reader = File.OpenText("existingfile.txt"))
                Console.WriteLine("Opened file.");
                result = await reader.ReadToEndAsync();
                Console.WriteLine("Contains: " + result);

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 4.5
Portable Class Library
Supported in: portable .NET platforms
Windows Phone Silverlight
Available since 8.0
Windows Phone
Available since 8.1
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