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Showing content from https://learn.microsoft.com/en-us/dotnet/api/system.io.streamreader.readtoendasync below:

StreamReader.ReadToEndAsync Method (System.IO) | Microsoft Learn

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

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

Source:

StreamReader.cs

Source:

StreamReader.cs

Source:

StreamReader.cs

Source:

StreamReader.cs

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

public:
 override System::Threading::Tasks::Task<System::String ^> ^ ReadToEndAsync();

public override System.Threading.Tasks.Task<string> ReadToEndAsync();

[System.Runtime.InteropServices.ComVisible(false)]
public override System.Threading.Tasks.Task<string> ReadToEndAsync();

override this.ReadToEndAsync : unit -> System.Threading.Tasks.Task<string>

[<System.Runtime.InteropServices.ComVisible(false)>]
override this.ReadToEndAsync : unit -> System.Threading.Tasks.Task<string>

Public Overrides Function ReadToEndAsync () As Task(Of 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.

Attributes

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 async Task Main()
        {
            await ReadCharacters();
        }

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

Imports System.IO

Module Module1

    Sub Main()
        ReadCharacters()
    End Sub

    Async Sub ReadCharacters()
        Dim result As String

        Using reader As StreamReader = File.OpenText("existingfile.txt")
            Console.WriteLine("Opened file.")
            result = Await reader.ReadToEndAsync()
            Console.WriteLine("Contains: " + result)
        End Using
    End Sub
End Module

This method stores in the task it returns all non-usage exceptions that the method's synchronous counterpart can throw. If an exception is stored into the returned task, that exception will be thrown when the task is awaited. Usage exceptions, such as ArgumentException, are still thrown synchronously. For the stored exceptions, see the exceptions thrown by ReadToEnd().

Source:

StreamReader.cs

Source:

StreamReader.cs

Source:

StreamReader.cs

Source:

StreamReader.cs

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

public:
 override System::Threading::Tasks::Task<System::String ^> ^ ReadToEndAsync(System::Threading::CancellationToken cancellationToken);

public override System.Threading.Tasks.Task<string> ReadToEndAsync(System.Threading.CancellationToken cancellationToken);

override this.ReadToEndAsync : System.Threading.CancellationToken -> System.Threading.Tasks.Task<string>

Public Overrides Function ReadToEndAsync (cancellationToken As CancellationToken) As Task(Of 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.

The stream reader has been disposed.

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

The cancellation token was canceled. This exception is stored into the returned task.

If this method is canceled via cancellationToken, some data that has been read from the current Stream but not stored (by the StreamReader) or returned (to the caller) may be lost.

This method stores in the task it returns all non-usage exceptions that the method's synchronous counterpart can throw. If an exception is stored into the returned task, that exception will be thrown when the task is awaited. Usage exceptions, such as ArgumentException, are still thrown synchronously. For the stored exceptions, see the exceptions thrown by ReadToEnd().

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