Problem with List<>.Sort()

[pinkfloydfan]

Hi there

In a Form I have created I am trying to Sort a List<string> extracted
from the Keys of a Dictionary. However, when I attempt to build the
project I get the following error:

Cannot implicitly convert type 'void' to 'object'

The relevant code is as follows:

private void Form1_Load(object sender, EventArgs e)
{
List<string> Keys1 = new
List<string>(Class1.Dictionary1.Keys);
this.listbox1.DataSource = Keys1.Sort();
}

Without the Sort it works fine but the Keys are obviously not sorted.

Can anyone help me to fix this please?

Many Thanks
Lloyd

 

[Jon Skeet [C# MVP]]

In a Form I have created I am trying to Sort a List<string> extracted
from the Keys of a Dictionary. However, when I attempt to build the
project I get the following error:

Cannot implicitly convert type 'void' to 'object'

The relevant code is as follows:

private void Form1_Load(object sender, EventArgs e)
{
List<string> Keys1 = new
List<string>(Class1.Dictionary1.Keys);
this.listbox1.DataSource = Keys1.Sort();
}

Without the Sort it works fine but the Keys are obviously not sorted.

Can anyone help me to fix this please?

Sort sorts the list in place, and returns void:

List<string> Keys1 = new List<string>(Class1.Dictionary1.Keys);
Keys1.Sort();
this.listbox1.DataSource = Keys1;

 

[Christof Nordiek]

Hi there

In a Form I have created I am trying to Sort a List<string> extracted
from the Keys of a Dictionary. However, when I attempt to build the
project I get the following error:

Cannot implicitly convert type 'void' to 'object'

The relevant code is as follows:

private void Form1_Load(object sender, EventArgs e)
{
List<string> Keys1 = new
List<string>(Class1.Dictionary1.Keys);
this.listbox1.DataSource = Keys1.Sort();

replace the line above by:
Keys.Sort();
this.listbox1.DataSource = Keys;

}

Without the Sort it works fine but the Keys are obviously not sorted.

Sort doesn't return a sorted list, but sorts the list in place.

Christof

 

[pinkfloydfan]

Excellent! Thanks very much for your quick responses

 

[Rudy Velthuis]

Hi there

In a Form I have created I am trying to Sort a List<string> extracted
from the Keys of a Dictionary. However, when I attempt to build the
project I get the following error:

Cannot implicitly convert type 'void' to 'object'

The relevant code is as follows:

private void Form1_Load(object sender, EventArgs e)
{
List<string> Keys1 = new
List<string>(Class1.Dictionary1.Keys);
this.listbox1.DataSource = Keys1.Sort();
}

The problem is the assignment. Sort() returns void.

List<string> Keys1 =
new List<string>(Class1.Dictionary1.Keys);
Keys1.Sort();
this.listbox1.DataSource = Keys1;