c# 替换所有中文、标点符号，全角转半角

　　　　private void btnStart_Click(object sender, EventArgs e)
{
var srcWords = ToDBC(txtSrc.Text.Trim());
var placeStr = Regex.Replace(srcWords, @"([\p{P}*])", " ");
placeStr = Regex.Replace(placeStr,@"([\u4e00-\u9fa5])", "");
var splitWords = placeStr.Split(new string[] { " " }, StringSplitOptions.RemoveEmptyEntries);
var words = splitWords.ToList().Select(item =>
{
if (item.Length > 0)
{
var first = item.Substring(0, 1).ToUpper();
var last = "";
if (item.Length > 2)
{
last = item.Substring(1, item.Length-1);
}
return first + last;
}
return "";
});
var joinWords = string.Join(" ", words);
Clipboard.SetText(joinWords);

txtDes.Text = AppendWords(joinWords);
MessageBox.Show("已将替换后的字符串复制到粘贴板");
}

/// <summary>
/// 替换所有的中文及标点符号
/// </summary>
/// <param name="str"></param>
/// <returns></returns>
string RemoveAllChineseAndSymbol(string str)
{
var placeStr = Regex.Replace(str, @"([\p{P}*])", " ");
placeStr = Regex.Replace(placeStr, @"([\u4e00-\u9fa5])", "");
return placeStr;
}
/// <summary>
/// 追加及替换内容
/// </summary>
/// <param name="str"></param>
/// <returns></returns>
string AppendWords(string str)
{
var append = Regex.Replace(ToDBC(txtAppend.Text.Trim()), @"[\p{P}*]", " ");
if (string.IsNullOrEmpty(append))
{
return str;
}
var i=combSelect.SelectedIndex;

if (i==0)
{
return str.Trim() + " " + append;
}else if (i==1)
{
return append + " " + str.Trim();
}else if (i==2)
{
var replaceTo=Regex.Replace(ToDBC(txtToReplace.Text.Trim()), @"[\p{P}*]", " ");
return str.Trim().Replace(append, replaceTo);
}
else
{
return str;
}
}
/// <summary>
/// 全角转半角
/// </summary>
/// <param name="input"></param>
/// <returns></returns>
public string ToDBC(string input)
{
char[] c = input.ToCharArray();
for (int i = 0; i < c.Length; i++)
{
if (c[i] == 12288)
{
c[i] = (char)32;
continue;
}
if (c[i] > 65280 && c[i] < 65375)
c[i] = (char)(c[i] - 65248);
}
return new String(c);
}

private void combSelect_SelectedIndexChanged(object sender, EventArgs e)
{
var cb=(ComboBox) sender;
txtToReplace.Visible = cb.SelectedIndex==2;
}