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小弟我 最近在涉獵C#
在寫 OOP 物件導入程式的設計
但有些不解程式的問題

例如要寫 加法的類別 如下

public class CountGuo
{
public double add_result { set; get; }
}

// define add method
public double add (double _op1, double _op2)
{
add_result = _op1 + _op2;
return add_result;

上述 物件類別

下面則是 介面的程式

private void button1_Click(object sender, EventArgs e)
{
CountGuo weict = new CountGuo();
weict.add_result = (double.Parse(tex1.Text + tex2.Text));
tex3.Text = (weict.add_result).ToString();

本來意思是要 textbox + textbox2 的數字相加 然後出現在 textbox3

例如 10+5 =15

不過 上述的程式 誤解成 把box1+box2 加起來 例如 10+10=1010

希望能幫小弟找出錯誤的地方 讓我加以改進

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