删除字符串 c # 中的最后一个特定字符

Try string.TrimEnd():

Something = Something.TrimEnd(',');

Try string.Remove();

string str = "1,5,12,34,";
string removecomma = str.Remove(str.Length-1);
MessageBox.Show(removecomma);

King King's answer is of course correct, and Tim Schmelter's comment is also good suggestion in your case.

But if you really want to remove the last comma in a string, you should find the index of the last comma and remove it like this:

string s = "1,5,12,34,12345";
int index = s.LastIndexOf(',');
Console.WriteLine(s.Remove(index, 1));

Output will be:

1,5,12,3412345

Here is a demonstration.

It is unlikely that you want this way but I want to point it out. And remember, the String.Remove method doesn't remove any characters in the original string, it returns new string.

Or you can convert it into Char Array first by:

string Something = "1,5,12,34,";
char[] SomeGoodThing=Something.ToCharArray[];

Now you have each character indexed:

SomeGoodThing[0] -> '1'
SomeGoodThing[1] -> ','

Play around it

The TrimEnd method takes an input character array and not a string. The code below from Dot Net Perls, shows a more efficient example of how to perform the same functionality as TrimEnd.

static string TrimTrailingChars(string value)
{
int removeLength = 0;
for (int i = value.Length - 1; i >= 0; i--)
{
char let = value[i];
if (let == '?' || let == '!' || let == '.')
{
removeLength++;
}
else
{
break;
}
}
if (removeLength > 0)
{
return value.Substring(0, value.Length - removeLength);
}
return value;
}

Dim psValue As String = "1,5,12,34,123,12"
psValue = psValue.Substring(0, psValue.LastIndexOf(","))

output:

1,5,12,34,123

Try below

Something..TrimEnd(",".ToCharArray());

When you have spaces at the end. you can use beliow.

ProcessStr = ProcessStr.Replace(" ", "");
Emails     = ProcessStr.TrimEnd(';');

Try this, string Something1= Something.Substring(0, Something.Length - 1 );