Ｃ#判断输入是否为汉字

//打印ＵＮＩ　128到65535

private void button1_Click(object sender, EventArgs e)
{
System.Text.StringBuilder s = new System.Text.StringBuilder();
for (int i = 128; i < 0xffff;i++ )
{
if (i % 20==0)
s.Append("/r/n");
s.AppendFormat("{0,3}",(char)i);

}
textBox1.Text = s.ToString();

}

//汉字在unicode中的16进制码中在“/u4e00”——"/u9fa5"(即"一"和“龥”)

private void button1_Click(object sender, EventArgs e)
{
textBox1.Text = string.Format("一：{0:x},龥：{1:x}", (int)'一', (int)'龥');
}

//判断输入是否为汉字

private void label1_Click(object sender, EventArgs e)
{
string s;
s = textBox1.Text;
foreach (char c in s)
{
int i = (int)c;

if (i < 0x4E00 || i > 0x9fa5)
label1.Text = "请输入汉字";
else
label1.Text = "输入正确";
}

}

private void button1_Click(object sender, EventArgs e)
{

string s;
int count = 0;

s = textBox1.Text;
int length = s.Length;
foreach (char c in s)
{
int i = (int)c;

if (i < 0x4E00 || i > 0x9fa5)
textBox2.Text = "请输入汉字";
else
count++;
//label1.Text = "输入正确";
}
textBox2.Text = count.ToString() + "-" + (length - count).ToString();

}