namespace _
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string yuan = textBox1.Text;
            string cha = textBox2.Text;
            int n=0;
            for (int i = 0; i < yuan.Length; i++)
            {
                n = yuan.IndexOf(cha, i);
                i += n;
            }
          textBox1.SelectionStart=n;
          textBox1.SelectionLength = yuan.Length;

        }
    }
}
请问我这样为什么不能选中texebox1要查找的字串，还有这样做正不正确...因为我做出来的效果是选不中要查找的字串的？？？

   public partial class Form1 : Form
    {
        private String t3="";
        private Int32 n=0;
        public Form1()
        {
            InitializeComponent();
            button1.Click += new EventHandler(button1_Click);
        }

        void button1_Click(object sender, EventArgs e)
        {
          String  t1 = textBox1.Text;
          String  t2 = textBox2.Text;
            foreach (var c in t2)
            {
                for (int i = 0; i < t1.Length; i++)
                {
                    if (c == t1[i])
                    {
                        t3 = t3 + c;
                    }
                }
            }
           textBox1.Focus();
           textBox1.SelectionStart =t1.IndexOf(t3[n]) ;
           textBox1.SelectionLength = 1;
           n++;
        }
    }

陈俊杰啊、你MD。也跑这来啦。我还以为谁呢

你谁？？？

不用这么麻烦吧...简化一点可以哦...

钟娘有