c# Task Func Return Value Net4.5 Style

NET 4.5

The recommended way in .NET 4.5 is to use Task.FromResult, Task.Run or Task.Factory.StartNew:

--FromResult:

public async Task DoWork()
{
int res = await Task.FromResult(GetSum(4, 5));
}

private int GetSum(int a, int b)
{
return a + b;
}


Please check out Stefan’s comments on the usage of FromResult in the comments section below the post.

--Task.Run:


public async Task DoWork()
{
Func function = new Func(() => GetSum(4, 5));
int res = await Task.Run(function);
}

private int GetSum(int a, int b)
{
return a + b;
}


--Task.Factory.StartNew:


public async Task DoWork()
{
Func function = new Func(() => GetSum(4, 5));
int res = await Task.Factory.StartNew(function);
}

private int GetSum(int a, int b)
{
return a + b;
}


=========================== My Code ===================
Action actone;
Func funcone;
Action acttwo;


private async void pictureBox1_MouseClick(object sender, MouseEventArgs e)
{
int posX = e.X;
int posY = e.Y;

actone = ActMethod;
funcone = ActMethod3;
acttwo = ActMethod2;

await Task.Factory.StartNew(() => actone());
await Task.Factory.StartNew(actone);
await Task.Factory.StartNew(() => acttwo(posX, posY));

string reu = await Task.FromResult(funcone(posX, posY));

string result = await Task.Run(() => funcone(posX, posY));
}

void ActMethod()
{
Console.WriteLine("done");
}

void ActMethod2(int posX, int posY)
{
Console.WriteLine("done");
}

string ActMethod3(int posX, int posY)
{
Console.WriteLine("done");
return "func done";
}