比较 textBox1.Text 和 textBox2.Text

Question

所以我有这个代码

public partial class Form1 : Form
{
    public string str;
    public string str2;
    public Form1()
    {

        InitializeComponent();
        str = textBox1.Text;
        str2 = textBox2.Text;
    }

    private void button1_Click(object sender, EventArgs e)
    {
        if (String.IsNullOrEmpty(textBox1.Text))
        {
            MessageBox.Show("Enter Material Name Please.");     
        }

        if (str == str2)
        {
            MessageBox.Show("Materials are equal.");
        }

        else if (str != str2)
        {
            MessageBox.Show("Materials don't match.");
        }
    }
}

我想你会猜到我想在这里做什么..你能告诉它有什么问题吗？我是几天前开始的，所以请原谅我缺乏知识。

Answer 1

您只在构造函数中初始化这些字符串一次，而不是在点击事件处理程序中。您还可以使用属性将控件与字符串进行映射，从而使代码更具可读性和健壮性：

// use meaningful control/variable names
string Material1 
{
    get { return textBox1.Text; }
    set { textBox1.Text = value; }
}

string Material2
{
    get { return textBox2.Text; }
    set { textBox2.Text = value; }
}

private void button1_Click(object sender, EventArgs e)
{ 
    if (String.IsNullOrWhiteSpace(Material1)) // handles also multiple spaces
    {
        MessageBox.Show("Enter Material Name Please.");  
        // return; <-- perhaps?   
    }

    if (Material1 == Material2)
    {
        MessageBox.Show("Materials are equal.");
    }
    else
    {
        MessageBox.Show("Materials don't match.");
    }
}