查找textbox中的值能否存在于listbox中，求老司机kan’a’k

app = (IvcApplication)new vc3DCreate.vcc3DCreate();
            for (int c = 0; c < app.ComponentCount; c++)
            {
                IvcComponent comp = app.getComponent(c);
                object name = comp.getProperty("Name");
                listBox1.Items.Add(name);  
            }
            [color=#00FF00]string[] t = textBox5.Text.Split("->".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);//分割textbox 的值
            int xxx = 0;//计数xxx
            for (int idx = 0; idx < t.Length; idx++)
            {
                foreach (var item in listBox1.Items)
                {
                    if ((item.ToString()) == (t[idx]))//当存t中值存在于list，计数变量加1
                    {
                        xxx += 1;
                    }
                }
            }
            if (xxx == t.Length)//说明text的值都存在于listbox中
            {
                //执行操作
            }
            else
            {
               //提示错误
            }