private void Form3_Load(object sender, EventArgs e)
        
       {
             this.progressBar1.Enabled = true;
             this.progressBar1.Value = 0;
             this.progressBar1.Maximum = 100;
             this.progressBar1.Minimum = 0;
             this.progressBar1.Step = 50;
             this.timer1.Enabled = true;
             this.timer1.Start();
       }
       private void timer1_Tick_1(object sender, EventArgs e)
       {
           if (this.progressBar1.Value< 100)
               this.progressBar1.Value = this.progressBar1.Value + 20;
           if (this.progressBar1.Value == 100)
            {
                timer1.Enabled = false;
                Form4 form4 = new Form4();
                form4.Show();
                this.Hide();
            }
        }

       }
为什么进度条还没有读完，就show form4 了
应当怎么改

问你个问题，是不是总到80%的时候就show form4？

好像是

视觉与思维的误差。。。。
你把最后的一句 this.Hide();注释掉试试，你就明白是怎么回事了。。

怎么解决呢？？！！

实际执行完了呀，要解决什么问题？

应该是没有执行到100就出现form4了

怎么可能？你根据程序的逻辑来推呀。。。。。实在不行，F11单步跟踪看看。。。。从80到100的瞬间就执行了=100条件成立里的语句，this.hide（）造成的视觉误差吧。。

可是。。。就是不成功呀，将进度改到很慢，就发现根本没有到100%

private void Form3_Load(object sender, EventArgs e)
        
       {
             this.progressBar1.Enabled = true;
             this.progressBar1.Value = 0;
             this.progressBar1.Maximum = 100;
             this.progressBar1.Minimum = 0;
             this.progressBar1.Step = 50;
             this.timer1.Enabled = true;
             this.timer1.Start();
       }
       private void timer1_Tick_1(object sender, EventArgs e)
       {
           if (this.progressBar1.Value< 100)
               this.progressBar1.Value = this.progressBar1.Value + 20;
           if (this.progressBar1.Value == 100)
            {
                timer1.Enabled = false;
                Form4 form4 = new Form4();
                form4.Show();
              //  this.Hide(); 注释掉这一句，你再运行看看，到底有没到100
            }
        }

       }