文本框文本修剪允许 1 个空格 ASP NET C#

Question

我有一个文本框，我想允许 1 个空格。所以现在，修剪方法不允许它，但是无论如何允许 1 个空格吗？

C#：

bool before = txtSearchFor.Text.StartsWith(" ");
bool after = txtSearchFor.Text.EndsWith(" ");
string newText = before && after
                 ? txtSearchFor.Text.Trim() + " "
                 : before ? " " + txtSearchFor.Text.TrimStart() : after ? txtSearchFor.Text.TrimEnd() + " " : txtSearchFor.Text;
var contacts = SearchNRender(ExtCatIdentifier.All.ToString(), txtSearchFor.Text = newText);
var searchFormat = string.Format("[ {0} ]", txtSearchFor.Text);

Answer 1

bool before = txtSearchFor.Text.StartsWith(" ");
bool after  = txtSearchFor.Text.EndsWith(" ");
string newText = before && after 
                 ? txtSearchFor.Text.Trim() + " " 
                 : before ? " " + txtSearchFor.Text.TrimStart() : after ? txtSearchFor.Text.TrimEnd() + " " : txtSearchFor.Text;
txtSearchFor.Text = newText;

Answer 2

使用以下简单代码：

string t = txtSearchFor.Text;
if (t.StartsWith(" ")) //starts is blank, end may be blank or not
    t = " " + t.Trim(); 
else if (t.EndsWith(" ")) //only end is blank
    t = t.TrimEnd() + " ";
txtSearchFor.Text = t;

//Outputs:
// "    abc def   " => " abc def"
// "abcd def      " => "abc def "
// "    abc def" => " abc def"