我正在写一个c#windows窗体代码

我正在写一个c#windows窗体代码来 从button1和button2中获取数字，并将它们添加到文本框中，但编译器会在convert.toint32（textbox3.text）语句中争论 而且它还增加了

两个变量

和

三个变量

的值，我怎样才能在保持不变的同时增加文本框的值呢 我需要一个解决方案

  int Three = 0;
    int Two   = 0;
    //int one   = 0;
    int sum   = 0;
   // int sum   = 0;
    //int dec   = 0;

    public Form1()
    {

        InitializeComponent();

    }

    private void Form1_Load(object sender, EventArgs e)
    {
       // MessageBox.Show("Enter the teams` name");

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

        //Three += 3;
        //textBox3.Text = sum.ToString();
        Three += 3;
        sum = Convert.ToInt32(textBox3.Text) + Three;
        textBox3.Text = sum.ToString();


    }

    private void button2_Click(object sender, EventArgs e)
    {
        Two += 2;
        sum = Two + Convert.ToInt32(textBox3.Text) + Three;
        textBox3.Text =Convert.ToInt32(textBox3.Text) + Two.ToString();




    }

    private void textBox3_TextChanged(object sender, EventArgs e)
    {

        textBox3.Text = 0.ToString();
     } 

`改变

sum = Convert.ToInt32(textBox3.Text) + Three;

到

同时，移除

private void textBox3_TextChanged(object sender, EventArgs e)
{
    textBox3.Text = 0.ToString(); // this
}

---

因为它没有任何意义。

您的变量属于类，可以在构造函数中进行初始化。这可以通过多种方式完成，但您需要检查文本框是否有值，然后尝试转换并添加它

private int Two;
private int Three;
private int sum;

public Form1()
{
    this.Two = 0;
    this.Three = 0;
    this.sum = 0;
    InitializeComponent();

}

private void Form1_Load(object sender, EventArgs e)
{
   // MessageBox.Show("Enter the teams` name");

}
private void button1_Click(object sender, EventArgs e)
{
    this.Three += 3;
    sum = textBox3.Text != String.Empty ? Convert.ToInt32(textBox3.Text) : 0;
    textBox3.Text = Convert.ToString(sum + this.Three);
}

... same for number Two

private void textBox3_TextChanged(object sender, EventArgs e)
{
    textBox3.Text = "0";
} 

---

编译器争论…

不要通过争论降低你自己：）最初文本框是空的。无法将.ToInt32空字符串初始化为

3

到

3

而不是零。单击按钮时不要增加其值。现在，每次单击按钮时都会增加该值。

private int Two;
private int Three;
private int sum;

public Form1()
{
    this.Two = 0;
    this.Three = 0;
    this.sum = 0;
    InitializeComponent();

}

private void Form1_Load(object sender, EventArgs e)
{
   // MessageBox.Show("Enter the teams` name");

}
private void button1_Click(object sender, EventArgs e)
{
    this.Three += 3;
    sum = textBox3.Text != String.Empty ? Convert.ToInt32(textBox3.Text) : 0;
    textBox3.Text = Convert.ToString(sum + this.Three);
}

... same for number Two

private void textBox3_TextChanged(object sender, EventArgs e)
{
    textBox3.Text = "0";
}