在验证按钮时,我将String值转换为float值,但是当我尝试将转换后的值与实际的float进行比较时,我获得了编译错误。我想在此创建一个比较if,以便不允许在应用程序中写入低于50的值。
private void tbBid_Validating(object sender, CancelEventArgs e)
{
var amount = 12345678.0f;
tbBid.Text = amount.ToString();
if(amount.ToString()<50)
{
e.Cancel = true;
epbid.SetError(tbBid,">50 lei");
}
}
试试这个
//Reading value from text box
var amount = tbBid.Text;
//Parsing to float
float amountFloat = float.Parse(amount);
//Comparison
if (amountFloat < 50.0f)
{
// Do your cancellation stuff
}
我已经制作了一个可以帮助你的简化版本。我已经使用了您提供的代码以及金额首先是字符串值的版本:
// current example simplified
float amount = 12345678.0f;
string text = amount.ToString();
if(amount < 50)
{
Console.WriteLine("Congratulations the first comparison worked!");
}
//if amount was a string to start with
string amountText = "12345678.0";
float amountFloat;
float.TryParse(amountText, out amountFloat);
if(amountFloat < 50)
{
Console.WriteLine("Congratulations the second comparison worked!");
}
这是.Net小提琴:https://dotnetfiddle.net/utyWUc