Question

C#编辑缺少using指令或程序集

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
richTextBox1.SelectionFont = new Font("Tahoma", 12, FontStyle.Bold);
richTextBox1.SelectionColor = System.Drawing.Color.Red;
}

private void label1_Click(object sender, EventArgs e)
{

}
private void button1_Click(object sender, EventArgs e)
{
}
}
}

“WindowsFormsApplication1.Form1”不包含“richTextBox1_TextChanged”的定义，并且找不到可接受类型为“WindowsFormsApplication1.Form1”的第一个参数的扩展方法“richTextBox1_TextChanged”(是否缺少 using 指令或程序集引用?)

Answer 1

richTextBox1的TextChanged事件有问题，搜一下“richTextBox1_TextChanged”，把带richTextBox1_TextChanged的语句删除就可以了；

Answer 2

错误列表里点击它，跳转到报错行，删掉即可。