C＃-文本框输入的范围

Question

我有一个带有4个文本框的表单。我正在尝试编写一种方法来检查以确保第1个和第3个文本框中的输入在0到100之间。这是我发现的一个示例。但是，如果文本框只有1个参数，我对如何检查两个文本框感到困惑。我知道您需要转换输入，因为文本框仅接受字符串。我遇到的麻烦是在转换了两个文本框后，如何在此if语句中检查这两个文本框。您是否转换两个文本框，给它们指定不同的变量名，然后在2个不同的if语句中使用这些变量？对其他文本框重复此语句是否正确？

public bool IsWithinRange(TextBox textBox, string name, decimal min, decimal max)
        {
            number = txtOperand1.Text, txtOperand2.Text;

            if (number < 0 || number > 100)
            {
                MessageBox.Show(name + " must be between " + min + " and " + max + ".", "Entry Error");
                textBox.Focus();
                return false;
            }
            return true;
        }

Answer 1

[为了验证TextBox的值，您只需要解析每个字段的数据/文本，因为int只需解析，并且一种检查方法就足够了。

正如@Jimi指出的，对于WinForms：

private void button1_Click_1(object sender, EventArgs e)
{
    int f = 0, t = 0;

    if (Int32.TryParse(textBox1.Text, out f))
    {
        // successfully parsed 
    }

    if (Int32.TryParse(textBox3.Text, out t))
    {
        // successfully parsed 

    }

    // or just use parse..
    int f1 = Int32.Parse(textBox1.Text);
    int t1 = Int32.Parse(textBox3.Text);


    if (rangeCheck(f, t))
    {
       // Success 
    }
}
bool rangeCheck(int first, int third)
{
    return (first >= 0 && first <= 100 && third >= 0 && third <= 100);
}

您的表单设计器代码：根据需要进行修改

            // textBox1
            // 
            this.textBox1.Location = new System.Drawing.Point(230, 75);
            this.textBox1.Name = "textBox1";
            this.textBox1.Size = new System.Drawing.Size(100, 20);
            this.textBox1.TabIndex = 0;
            // 
            // textBox2
            // 
            this.textBox2.Location = new System.Drawing.Point(230, 123);
            this.textBox2.Name = "textBox2";
            this.textBox2.Size = new System.Drawing.Size(100, 20);
            this.textBox2.TabIndex = 1;
            // 
            // textBox3
            // 
            this.textBox3.Location = new System.Drawing.Point(230, 168);
            this.textBox3.Name = "textBox3";
            this.textBox3.Size = new System.Drawing.Size(100, 20);
            this.textBox3.TabIndex = 2;
            // 
            // textBox4
            // 
            this.textBox4.Location = new System.Drawing.Point(230, 211);
            this.textBox4.Name = "textBox4";
            this.textBox4.Size = new System.Drawing.Size(100, 20);
            this.textBox4.TabIndex = 3;
            // 
            // button1
            // 
            this.button1.Location = new System.Drawing.Point(230, 262);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(75, 23);
            this.button1.TabIndex = 4;
            this.button1.Text = "button1";
            this.button1.UseVisualStyleBackColor = true;
            this.button1.Click += new System.EventHandler(this.button1_Click_1);

使用WPF

 <TextBox Name="box1"  ...other_properties  />
 <TextBox Name="box2"  ...other_properties  />
 <TextBox Name="box3"  ...other_properties  />
 <TextBox Name="box4"  ...other_properties  />

 <Button Click="Button_Click" Content="Check for validity" ...other properties />

现在处理那些：

private void Button_Click(object sender, RoutedEventArgs e)
        {

            int f = 0, t = 0;

            if (Int32.TryParse(box1.Text, out f))
            {
               // successfully parsed 
            }

            if (Int32.TryParse(box3.Text, out t))
            {
                // successfully parsed 

            }

            // or just use parse..
            int f1 = Int32.Parse(box1.Text);
            int t1 = Int32.Parse(box3.Text);


            if (rangeCheck(f, t))
            {
                Debug.WriteLine("Both are within 0 and 100");
            }
        }

        bool rangeCheck(int first, int third)
        {
            return (first >= 0 && first <= 100 && third >= 0 && third <= 100);
        }

Answer 2

您可以使用以下代码来确保第一和第三文本框中的输入为

0到100之间。

private void button1_Click(object sender, EventArgs e)
        {
            int m = 0;
            int n = 0;
            bool a = int.TryParse(textBox1.Text, out  m);
            bool b = int.TryParse(textBox3.Text, out n);
            if(a&b==false)
            {
                MessageBox.Show("please enter number");
            }
            else
            {
                bool t = IsWithinRange(m,"textbox1", 1, 100);
                t= IsWithinRange(n, "textbox3", 1, 100);
            }

        }
        public bool IsWithinRange(int a, string name,decimal min, decimal max)
        {
            if(a>=min&&a<=max)
            {
                MessageBox.Show(name + " is between " + min + " and " + max + ".", "Right");
            }
            else
            {
                MessageBox.Show(name + " must be between " + min + " and " + max + ".", "Entry Error");
            }
            return true;
        }