输入不正确的值后,如何清除和显示清除的形式值
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08-10-2019 - |
题
我正在尝试弄清楚如何清除和显示(重置)我的清除式值后,在输入和检测到不正确的值后。当前,当我捕获不正确的输入时,即使我再次单击“ Enter”按钮,它也坐在那里。任何帮助将不胜感激。
namespace Mileage
{
public partial class Form2 : Form
{
private double beginMileage, endMileage, gallons, mpg;
public Form2()
{
InitializeComponent();
}
//Enter button click
public void menuItem1_Click(object sender, EventArgs e)
{
if (endMileage<beginMileage)
{
this.label5.Text = String.Format("ERROR: End mileage is less than begining mileage.");
}
else if((endMileage<0)||(beginMileage<0))
{
this.label5.Text = String.Format("ERROR: One or more mileage input is negative.");
}
else if ((endMileage == 0) || (gallons == 0))
{
this.label5.Text = String.Format("ERROR: The end mileage and/or gallon input is zero.");
}
else
{
beginMileage = double.Parse(this.textBox1.Text.Replace(" ", ""));
endMileage = double.Parse(this.textBox2.Text.Replace(" ", ""));
gallons = double.Parse(this.textBox3.Text.Replace(" ", "")) ;
mpg = ((endMileage - beginMileage) / gallons);
this.label5.Text = String.Format("{0}", mpg);
}
}
//exit button click
public void menuItem2_Click(object sender, EventArgs e)
{
Application.Exit();
}
}
}
解决方案
嗯。 。 。所以我发现了。这只是我做过的逻辑错误:)
namespace Mileage
{
public partial class Form2 : Form
{
private float beginMileage, endMileage, gallons, mpg;
public Form2()
{
InitializeComponent();
}
public void menuItem1_Click(object sender, EventArgs e)
{
beginMileage = float.Parse(this.textBox1.Text.Replace(" ", ""));
endMileage = float.Parse(this.textBox2.Text.Replace(" ", ""));
gallons = float.Parse(this.textBox3.Text.Replace(" ", ""));
if((endMileage<0)||(beginMileage<0)||(gallons<0))
{
this.label5.Text = String.Format("ERROR: One or more input(s) is negative.");
this.textBox1.Text = " ";
this.textBox2.Text = " ";
this.textBox3.Text = " ";
}
else if ((endMileage == 0) || (gallons == 0))
{
this.label5.Text = String.Format("ERROR: The end mileage and/or gallon input is zero.");
this.textBox1.Text = " ";
this.textBox2.Text = " ";
this.textBox3.Text = " ";
}
else if (endMileage < beginMileage)
{
this.label5.Text = String.Format("ERROR: End mileage is less than begining mileage.");
this.textBox1.Text = " ";
this.textBox2.Text = " ";
this.textBox3.Text = " ";
}
else
{
mpg = ((endMileage - beginMileage) / gallons);
this.label5.Text = String.Format("{0}", mpg);
}
}
public void menuItem2_Click(object sender, EventArgs e)
{
Application.Exit();
}
}
}
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