用增量int进行加法

本文关键字：int | 更新日期: 2023-09-27 18:08:10

我有一个独特的文本框id的问题。我的代码是创建一个div与4个文本框在我的数据库中的每艘船。每个创建的文本框必须具有唯一的ID。我这样做与增量int (int I = 0和i++)，但似乎不能得到它的工作。这是我的代码!

while (oReader.Read());
{
    int i = 0;
    System.Web.UI.HtmlControls.HtmlGenericControl createDiv =
    new System.Web.UI.HtmlControls.HtmlGenericControl("DIV");
    createDiv.ID = "createDiv";
    this.Controls.Add(createDiv);
    List<TextBox> tb_names = new List<TextBox>();
    TextBox tb_name = new TextBox();
    //TextBox tb_name = new TextBox();
    tb_name.ID = "CreateT_" + i.ToString() + "_1";
    tb_name.Text = oReader["SchipNaam"].ToString();
    createDiv.Controls.Add(new LiteralControl
    ("<div class='form-group'><div class='clearfix' ></div><div class='row'><div class='col-md-3'></div><div class='col-md-3'> Scheepspnaam: <input type='text' id='" + tb_name.ID + "' runat='server'/></div></div></div>"));
    tb_names.Add(tb_name);
    //TextBox tb_name1 = new TextBox();
    tb_name.ID = "CreateT_" + i.ToString() + "_1";
    tb_name.Text = oReader["RederijNr"].ToString();
    createDiv.Controls.Add(new LiteralControl
    ("<div class='form-group'><div class='clearfix' ></div><div class='row'><div class='col-md-3'></div><div class='col-md-3'> RederijNr:<input type='text' id='" + tb_name.ID + "' runat='server'/></div></div></div>"));
    tb_names.Add(tb_name);
    //TextBox tb_name2 = new TextBox();
    tb_name.ID = "CreateT_" + i.ToString() + "_1";
    tb_name.Text = oReader["Lengte"].ToString();
    createDiv.Controls.Add(new LiteralControl
    ("<div class='form-group'><div class='clearfix' ></div><div class='row'><div class='col-md-3'></div><div class='col-md-3'> Lengte  :<input type='text' id='" + tb_name.ID + "' runat='server'/></div></div></div>"));
    tb_names.Add(tb_name);
    //TextBox tb_name3 = new TextBox();
    tb_name.ID = "CreateT_" + i.ToString() + "_1";
    tb_name.Text = oReader["Laadvermogen"].ToString();
    createDiv.Controls.Add(new LiteralControl
    ("<div class='form-group'><div class='clearfix' ></div><div class='row'><div class='col-md-3'></div><div class='col-md-3'> Laadvermogen:<input type='text' id='" + tb_name.ID + "' runat='server'/></div></div></div>"));
    tb_names.Add(tb_name);
    i++;
}

我的输出总是CreateT_0_1。我做错了什么?我认为它以前工作，但似乎找不到问题。

我希望你们看到我做错了什么。

提前感谢!

用增量int进行加法

在每个while循环开始时创建值为0的i。在循环之前初始化整数，然后在循环中更新它，否则在每次迭代时它将重置为0。

在while循环中添加3个文本框，但只在while循环结束时增加i。您需要更改后缀，因为这始终是_1，或者在每个文本框之间使用i++以使标识符唯一。

正如Jon Skeet在上面的注释中提到的，不需要while起始行上的分号。

int i = 0;
while (oReader.Read())
{
    System.Web.UI.HtmlControls.HtmlGenericControl createDiv =
    new System.Web.UI.HtmlControls.HtmlGenericControl("DIV");
    createDiv.ID = "createDiv";
    this.Controls.Add(createDiv);
    List<TextBox> tb_names = new List<TextBox>();
    TextBox tb_name = new TextBox();
    //TextBox tb_name = new TextBox();
    tb_name.ID = "CreateT_" + i.ToString();
    tb_name.Text = oReader["SchipNaam"].ToString();
    createDiv.Controls.Add(new LiteralControl
    ("<div class='form-group'><div class='clearfix' ></div><div class='row'><div class='col-md-3'></div><div class='col-md-3'> Scheepspnaam: <input type='text' id='" + tb_name.ID + "' runat='server'/></div></div></div>"));
    tb_names.Add(tb_name);
    //TextBox tb_name1 = new TextBox();
    tb_name.ID = "CreateT_" + i.ToString() + "_1";
    tb_name.Text = oReader["RederijNr"].ToString();
    createDiv.Controls.Add(new LiteralControl
    ("<div class='form-group'><div class='clearfix' ></div><div class='row'><div class='col-md-3'></div><div class='col-md-3'> RederijNr:<input type='text' id='" + tb_name.ID + "' runat='server'/></div></div></div>"));
    tb_names.Add(tb_name);
    //TextBox tb_name2 = new TextBox();
    tb_name.ID = "CreateT_" + i.ToString() + "_2";
    tb_name.Text = oReader["Lengte"].ToString();
    createDiv.Controls.Add(new LiteralControl
    ("<div class='form-group'><div class='clearfix' ></div><div class='row'><div class='col-md-3'></div><div class='col-md-3'> Lengte  :<input type='text' id='" + tb_name.ID + "' runat='server'/></div></div></div>"));
    tb_names.Add(tb_name);
    //TextBox tb_name3 = new TextBox();
    tb_name.ID = "CreateT_" + i.ToString() + "_3";
    tb_name.Text = oReader["Laadvermogen"].ToString();
    createDiv.Controls.Add(new LiteralControl
    ("<div class='form-group'><div class='clearfix' ></div><div class='row'><div class='col-md-3'></div><div class='col-md-3'> Laadvermogen:<input type='text' id='" + tb_name.ID + "' runat='server'/></div></div></div>"));
    tb_names.Add(tb_name);
    i++;
}

您已经将1作为该行中的固定字符串tb_name。ID = "CreateT_" + i.ToString() + "_1";所以它不起作用试试下面的代码

while (oReader.Read());
            {
                int i = 0;
                System.Web.UI.HtmlControls.HtmlGenericControl createDiv =
                new System.Web.UI.HtmlControls.HtmlGenericControl("DIV");
                createDiv.ID = "createDiv";
                this.Controls.Add(createDiv);
                List<TextBox> tb_names = new List<TextBox>();
                TextBox tb_name = new TextBox();

                 var lstText=new List<string>
                    {
                    "Scheepspnaam",
                    "RederijNr",
                    "Lengte",
                    "Laadvermogen"
                };
                for (int j = 0; j < 4; j++)
                {
                    tb_name.ID = "CreateT_" + i + "_" + (j+1);
                    //tb_name.Text = oReader["SchipNaam"].ToString();
                    createDiv.Controls.Add(new LiteralControl
                        ("<div class='form-group'><div class='clearfix' ></div><div class='row'><div class='col-md-3'></div><div class='col-md-3'> " + lstText[j] +
                         ": <input type='text' id='" + tb_name.ID + "' runat='server'/></div></div></div>"));
                    tb_names.Add(tb_name);
                } 
                i++;
            }

如果你在这里使用for循环，你可以减少代码行数

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