c#字符处理小练习

using System.Text.RegularExpressions;  float _a;  _a = 1.45F;  MessageBox.Show(_a.ToString());  char a = '古';  MessageBox.Show(a.ToString());  decimal _b;  _b = 1.232M;  MessageBox.Show(_b.ToString());  string str = "afdg";  string[] str1 =str.Split("g".ToCharArray());  MessageBox.Show(str1[0].ToString());               string[] str2=Regex.Split(str, "g");  MessageBox.Show(str2[0].ToString());  MessageBox.Show (comboBox1.Text.GetType().ToString());  // string[] subStrs = str3.Split("g".ToCharArray());  //MessageBox.Show(subStrs[0].Trim().ToString());  this.comboBox1.Items.Add("Comboboxg1");  this.comboBox1.Items.Add("Comboboxg2");  this.comboBox1.Items.Add("Comboboxg3");  foreach (object item in this.comboBox1.Items)    {        string[] subStrs =item.ToString().Split("g".ToCharArray());    MessageBox.Show(subStrs[0].ToString());    if (subStrs[0].Trim().Equals(this.Text))      {         this.comboBox1.SelectedItem = item;         this.comboBox1.SelectAll();          break;       }    }