通过在页面加载时动态创建的按钮单击事件更新列表项.(指数超出范围)

Question

嗨，我正在尝试从页面加载中的列表动态创建按钮和文本框。 按钮附加了一个单击事件，该事件将一个添加到文本框中。 同时发生这种情况，我想将相应的列表项更新为新数字。

我的问题是我收到错误：

指数超出范围。必须为非负数且小于 集合。参数名称：索引

我似乎不明白为什么我会收到错误，从而如何解决我的问题。 下面我准备了一个重现该问题的代码示例：

public partial class _Default : Page
{
List<ProductRates> ProductRateList = new List<ProductRates>() {
new ProductRates(1,"Test",0),
new ProductRates(2,"Test2",0),
new ProductRates(3,"Test3",0)
};
protected void Page_Load(object sender, EventArgs e)
{
for (int i = 0; i < ProductRateList.Count; i++)
{
double testing = ProductRateList[i].ProductOrderAmount;
TextBox textBox = new TextBox();                
textBox.Text = "0";
textBox.ID = ProductRateList[i].ProductName + "TextBox";
Button plusButton = new Button();               
plusButton.Text = "+";
plusButton.ID = ProductRateList[i].ProductName + "PinusButton";
plusButton.Click += (se, ev) => PlusButton_Click(se, ev, ProductRateList,i, textBox);                             
System.Web.UI.HtmlControls.HtmlGenericControl createButtonDiv =
new System.Web.UI.HtmlControls.HtmlGenericControl("DIV");
createButtonDiv.ID = ProductRateList[i].ProductName + "createButtonDiv";
createButtonDiv.Attributes.Add("class", "col-md-6");
createButtonDiv.Controls.Add(plusButton);
createButtonDiv.Controls.Add(textBox);              
ProductPlaceholderDiv.Controls.Add(createButtonDiv);
}
}
void PlusButton_Click(Object sender, EventArgs e, List<ProductRates> ProductRateList, int i, TextBox textBox)
{
string test = textBox.Text;
ProductRateList[i].ProductOrderAmount = 1 + double.Parse(test);
textBox.Text = (ProductRateList[i].ProductOrderAmount).ToString();
}
public class ProductRates
{            
public ProductRates(int prodductId, string productName , double productOrderAmount  )
{
ProdductId = prodductId;
ProductName = productName;
ProductOrderAmount = productOrderAmount;
}
//Product
public int ProdductId { get; set; }
public string ProductName { get; set; }          
public double ProductOrderAmount { get; set; }            
}
}

Answer 1

1( 使用以下新事件处理程序 =>

private void PlusButton_Click1(object sender, EventArgs e)
{
Button btn = (Button)sender;
System.Web.UI.HtmlControls.HtmlGenericControl div =(System.Web.UI.HtmlControls.HtmlGenericControl)btn.Parent;
string ProductName = btn.ID.Substring(0, btn.ID.Length - "PinusButton".Length);
TextBox txt = (TextBox)div.FindControl(ProductName + "TextBox");
txt.Text = (Convert.ToInt32(string.IsNullOrEmpty(txt.Text)? "0":txt.Text) + 1).ToString();
}

2( 订阅为 =>

加号按钮。单击 += PlusButton_Click1;

如果解决方案适合您，请投票。谢谢。。享受编码

Answer 2

我已经通过@RiteshKulkarni答案解决了我的问题。 即使可能有更好的解决方案，如果有人知道答案，请告诉我。

然后在@RiteshKulkarni发布的点击事件上，我添加了一个循环，用于检查名称是否是对应的名称，并使用它来将值存储在列表中。

如果有人知道实现这一目标的更好方法，请告诉我。

public partial class _Default : Page
{
List<ProductRates> ProductRateList = new List<ProductRates>() {
new ProductRates(1,"Test",0),
new ProductRates(2,"Test2",0),
new ProductRates(3,"Test3",0)
};
protected void Page_Load(object sender, EventArgs e)
{
for (int i = 0; i < ProductRateList.Count; i++)
{
double testing = ProductRateList[i].ProductOrderAmount;
TextBox textBox = new TextBox();                
textBox.Text = ProductRateList[i].ProductOrderAmount.ToString();
textBox.ID = ProductRateList[i].ProductName + "TextBox";
Button plusButton = new Button();               
plusButton.Text = "+";
plusButton.ID = ProductRateList[i].ProductName + "PinusButton";
plusButton.Click += PlusButton_Click1;
System.Web.UI.HtmlControls.HtmlGenericControl createButtonDiv =
new System.Web.UI.HtmlControls.HtmlGenericControl("DIV");
createButtonDiv.ID = ProductRateList[i].ProductName + "createButtonDiv";
createButtonDiv.Attributes.Add("class", "col-md-6");
createButtonDiv.Controls.Add(plusButton);
createButtonDiv.Controls.Add(textBox);              
ProductPlaceholderDiv.Controls.Add(createButtonDiv);
}
}
private void PlusButton_Click1(object sender, EventArgs e)
{
Button btn = (Button)sender;
System.Web.UI.HtmlControls.HtmlGenericControl div = (System.Web.UI.HtmlControls.HtmlGenericControl)btn.Parent;
string ProductName = btn.ID.Substring(0, btn.ID.Length - "PinusButton".Length);
TextBox txt = (TextBox)div.FindControl(ProductName + "TextBox");           
for (int i = 0; i < ProductRateList.Count; i++)
{
if (ProductRateList[i].TextBoxName == ProductName + "TextBox")
{
ProductRateList[i].ProductOrderAmount = double.Parse(txt.Text) + 1;
txt.Text = ProductRateList[i].ProductOrderAmount.ToString();
}
}
}
public class ProductRates
{            
public ProductRates(int prodductId, string productName , double productOrderAmount  )
{
ProdductId = prodductId;
ProductName = productName;
ProductOrderAmount = productOrderAmount;
}
//Product
public int ProdductId { get; set; }
public string ProductName { get; set; }          
public double ProductOrderAmount { get; set; }
public string TextBoxName { get; set; }
}
}