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int sum = 0;
for (int i = 1; i <= 12; i++)
{
TextBox tb = this.Controls["textBox" + i.ToString()] as TextBox;
sum += Convert.ToInt32(tb.Text);
}
Console.WriteLine("它们的和为:{0}",sum);
int x=0;
for(control c in this.controls)
{
if(c is TextBox)
{
TextBox tb =(TextBox)c;
x +=Convert.Toint32(tb.Text.trim());
}
}