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;
}
}