Question

c#编程错误 1 未能找到类型或命名空间名称“Form”(是否缺少 using 指令或程序集引用?)

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;
using System.IO;
namespace RC5
{ public partial class RC5Form : Form
{ public RC5Form()
{ InitializeComponent();
}
private void sourceFileButton_Click(object sender, EventArgs e)
{ if (openFileDialog.ShowDialog() == DialogResult.OK)
{ sourceFileTextBox.Text = openFileDialog.FileName; }
}rgetFileButton_Click(object sender, EventArgs e)
{ if (saveFileDialog.ShowDialog() == DialogResult.OK)
{
targetFileTextBox.Text = saveFileDialog.FileName;
}
}
private void keyButton_Click(object sender, EventArgs e)

Answer 1

没有引用System.Windows.Forms吧

Answer 2

你确认是否建立了 form4 这个窗体
大小写有没有搞错，是不是 Form4 ?