Question

我有三个Textboxes，我不知道如何分开彼此以获得正确的值。我在Textboxes中创建GetTrix();，当我尝试更新值时，值是错误的，因为它们之间没有区别。

    protected void btnUpdate_Click(object sender, EventArgs e)
{
    string TrixName = null;
    string TrixID = null;
    string Hardness = null;
    string Webpage = null;

    foreach (Control c in phdTrix.Controls)
    {
        if (c.GetType() == typeof(TextBox))
        {
            //This is where there is no difference between the textboxes

            TrixName = (c as TextBox).Text;
            TrixID = (c as TextBox).ID;
            Hardness = (c as TextBox).Text;
            Webpage = (c as TextBox).Text;

            UpdateTrix(TrixID, TrixName, Hardness, Webpage);
        }
    }
}

private void GetTrix()
{
    DataTable table = CategoryAccess.GetAllTrix();

    for (int i = 0; i < table.Rows.Count; i++)
    {
        TextBox textbox = new TextBox();
        textbox.ID = table.Rows[i]["TrixID"].ToString();
        textbox.Text = table.Rows[i]["TrixName"].ToString();

        Literal literal1 = new Literal();
        literal1.Text = "<p>";

        TextBox textbox2 = new TextBox();
        textbox2.Text = table.Rows[i]["Hardness"].ToString();

        TextBox textbox3 = new TextBox();
        textbox3.Text = table.Rows[i]["Webpage"].ToString();

        Literal literal2 = new Literal();
        literal2.Text = "</p>";

        phdTrix.Controls.Add(literal1);
        phdTrix.Controls.Add(textbox);
        phdTrix.Controls.Add(textbox2);
        phdTrix.Controls.Add(textbox3);
        phdTrix.Controls.Add(literal2);
    }
}

这将是一个逻辑解决方案。但是很有效。

TrixName = (c as TextBox textbox).Text; 
Hardness = (c as TextBox textbox2).Text;
Webpage = (c as TextBox textbox3).Text;

新代码：

    protected void btnUpdate_Click(object sender, EventArgs e)
{
    string TrixID = null;
    string TrixName = null;
    string Hardness = null;
    string Webpage = null;

    foreach (Control c in phdTrix.Controls)
    {
        if (c.GetType() == typeof(TextBox))
        {
            TrixID = (c as Literal).Text;

            switch (c.ID)
            {

                case "TrixName":
                    TrixName = (c as TextBox).Text;
                    break;
                case "Hardness":
                    Hardness = (c as TextBox).Text;
                    break;
                case "Webpage":
                    Webpage = (c as TextBox).Text;
                    break;
            }

            UpdateTrix(TrixID, TrixName, Hardness, Webpage);
        }
    }
}



private void GetTrix()
{
    DataTable table = CategoryAccess.GetAllTrix();

    for (int i = 0; i < table.Rows.Count; i++)
    {
        Literal literalTrixID = new Literal();
        literalTrixID.Text = table.Rows[i]["TrixID"].ToString();
        literalTrixID.Visible = false;

        TextBox textbox = new TextBox();
        textbox.ID = "TrixName";
        textbox.Text = table.Rows[i]["TrixName"].ToString();

        Literal literal1 = new Literal();
        literal1.Text = "<p>";

        TextBox textbox2 = new TextBox();
        textbox2.ID = "Hardness";
        textbox2.Text = table.Rows[i]["Hardness"].ToString();

        TextBox textbox3 = new TextBox();
        textbox3.ID = "Webpage";
        textbox3.Text = table.Rows[i]["Webpage"].ToString();

        Literal literal2 = new Literal();
        literal2.Text = "</p>";

        phdTrix.Controls.Add(literalTrixID);
        phdTrix.Controls.Add(literal1);
        phdTrix.Controls.Add(textbox);
        phdTrix.Controls.Add(textbox2);
        phdTrix.Controls.Add(textbox3);
        phdTrix.Controls.Add(literal2);
    }
}

我收到错误：找到了几个具有相同ID（TrixName）的控件。 FindControl必须拥有唯一ID。

Answer 1

好吧不会有。

您正在循环控件foreach (Control c in phdTrix.Controls)和每次您找到一个文本框，您正在执行以下操作：

        TrixName = (c as TextBox).Text;
        Hardness = (c as TextBox).Text;
        Webpage = (c as TextBox).Text;

这将为每个变量分配相同的文本框。

最简单的解决方案是在创建每个文本框时为其分配唯一标识符，然后使用它来确定所需的文本框。您可以使用ID属性。那么你可以这样：

string TrixName = null;
string Hardness = null;
string Webpage = null;

foreach (Control c in phdTrix.Controls)
{
    if (c.GetType() == typeof(TextBox))
    {
        switch (c.ID)
        {
            case "TrixName":
                TrixName = (c as TextBox).Text;
                break;
            case "Hardness":
                Hardness = (c as TextBox).Text;
                break;
            case "Webpage":
                Webpage = (c as TextBox).Text;
                break;
        }

        UpdateTrix(TrixID, TrixName, Hardness, Webpage);
    }
}

您的创作代码必须是：

    TextBox textbox = new TextBox();
    textbox.ID = "TrixName";
    textbox.Text = table.Rows[i]["TrixName"].ToString();

    TextBox textbox2 = new TextBox();
    textbox2.ID = "Hardness";
    textbox2.Text = table.Rows[i]["Hardness"].ToString();

    TextBox textbox3 = new TextBox();
    textbox3.ID = "Webpage";
    textbox3.Text = table.Rows[i]["Webpage"].ToString();

您需要一些其他方式来存储TrixID，因为当您要读取数据时，必须采用确定的方法来识别控件。

但是，如果您在页面上有多组这些控件，则这不会起作用，因为每个ID都必须是唯一的。在这种情况下，您需要在创建控件时在控件上附加唯一ID（GUID）：

textbox.ID = "TrixName_" + Guid.NewGuid().ToString();

然后当你想找到控件时使用string.Split()去除GUID：

string[] nameParts = c.ID.Split('_');
switch (nameParts[0])
{
    .... as before.
}

如何在控件中分隔不同的文本框？

1 个答案: