动态文本框类型有问题吗? [英] Dynamic textbox type problem?

问题描述

我创建了动态文本框控件

如果要输入字符串，我想做的是将其转换为整数值，但是它给了我从"DateTime"到"Int32"的无效转换".
我在textboox中输入了234，但文本框看到了datetime.为什么?

我认为在创建动态文本框控件时，应指定文本框的控件类型.

谢谢您的时间！


代码:

I created dynamic textbox control

I want to do if you enter a string I will convert it to an integer value, but it gives me "Invalid cast from ''DateTime'' to ''Int32''".
I entered 234 into the textboox, but textbox sees datetime. Why?

I think when I create a dynamic textbox control I should specify the textbox''s control type.

Thanks your time!


Code:

TextBox txtSayi = new TextBox();
Button btnHesapla = new Button();
Label lblYazi = new Label();
this.Controls.Add(btnHesapla);
this.Controls.Add(txtSayi);
this.Controls.Add(lblYazi);


txtSayi.Location = new Point(100, 150);

lblYazi.Location = new Point(100, 100);
btnHesapla.Text = "HESAPLA";
btnHesapla.Location = new Point(100, 200);
btnHesapla.Size = new Size(20, 20);
btnHesapla.Width = 150;
btnHesapla.Height = 50;
btnHesapla.FlatStyle = FlatStyle.Flat;

btnHesapla.Click += new EventHandler(btnHesapla_Click);

这是按钮单击处理程序:

This is the button click handler:

void btnHesapla_Click(object sender, EventArgs e)
{
    int deg = Convert.ToInt32(txtSayi);gives me an error here
    int yuzler, onlar, birler;
    string yuzz, onn, birr;

    yuzler = (((deg) / 100) * 100);
    yuzz = cevir(yuzler);
    onlar = (((deg) / 10) * 10) - yuzler;
    onn = cevir(onlar);
    birler = ((deg) % 10);
    birr = cevir(birler);
    lblYazi = yuzz + " " + onn + " " + birr;
}

推荐答案

int deg = Convert.ToInt32(txtSayi);

请输入txtSayi.Text

即

Please put txtSayi.Text

i.e.

Convert.ToInt32(txtSayi.Text);

我想这将解决问题

I suppose this will solve the problem

int deg = Convert.ToInt32(txtSayi);gives me an error here

应该是

should be

int deg = Convert.ToInt32(txtSayi.Text);

实际上，您应该始终使用 TryParse() [

In reality you should always use TryParse()[^] method(s) which let you check for invalid characters.

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