C# 在Visual Studio C中向表中添加行#

我试图在每次单击按钮时向对象表添加新行，但当我单击按钮时，它只会编辑和覆盖同一行

protected void btAgregaT_Click(object sender, EventArgs e)
{
    TableRow t = new TableRow();

    TableCell c = new TableCell();
    c.Text = DDLArticulos.SelectedItem.ToString();
    t.Cells.Add(c);

    TableCell c2 = new TableCell();
    c2.Text = TBCantidad.Text;
    t.Cells.Add(c2);

    tablaPed.Rows.Add(t);    

}

---



您可以向DataTable添加新行，如下所示：

var newRow = tablaPed.NewRow();
newRow["Column1"] = "Value1";
newRow["Column3"] = "Value2";
newRow["Column3"] = "Value3";
tablaPed.Rows.Add(newRow);

---

您可以向DataTable添加新行，如下所示：

var newRow = tablaPed.NewRow();
newRow["Column1"] = "Value1";
newRow["Column3"] = "Value2";
newRow["Column3"] = "Value3";
tablaPed.Rows.Add(newRow);

更新2: 基本上，您需要使用ViewState来管理一切。下面我还提到了添加，简单地说，您可以从ViewState添加、编辑、删除记录，并将它们绑定到gridview

protected void Page_Load(object sender, EventArgs e)
    {
        try
        {
            //Adding data to datatable
            DataRow t = tablaPed.NewRow();

            //adding data to row
            t["SrNo"] = "1";
            t["EmailId"] = "test@gmail.com";
            t["Password"] = "Password";

            //adding row to table
            tablaPed.Rows.Add(t);

            //saving databale into viewstate   
            ViewState["UserDetail"] = t;

            //bind Gridview  
            GridView1.DataSource = t;
            GridView1.DataBind(); 
        }
    }

下面是单击“添加”按钮时要调用的函数：

private void AddNewRecordRowToGrid()
    {
        // check view state is not null  
        if (ViewState["UserDetail"] != null)
        {
            //get datatable from view state   
            DataTable dtCurrentTable = (DataTable)ViewState["UserDetail"];
            DataRow drCurrentRow = null;

            if (dtCurrentTable.Rows.Count > 0)
            {
                //this will add previously added entries 
                for (int i = 1; i <= dtCurrentTable.Rows.Count; i++)
                {

                    //add each row into data table  
                    drCurrentRow = dtCurrentTable.NewRow();
                    //you can add data from textbox or other user control
                    drCurrentRow["SrNo"] = "2";
                    drCurrentRow["EmailId"] = "test@gmail.com";
                    drCurrentRow["Password"] = "Password";

                }
                //Remove initial blank row  
                if (dtCurrentTable.Rows[0][0].ToString() == "")
                {
                    dtCurrentTable.Rows[0].Delete();
                    dtCurrentTable.AcceptChanges();

                }

                //add created Rows into dataTable  
                dtCurrentTable.Rows.Add(drCurrentRow);
                //Save Data table into view state after creating each row  
                ViewState["UserDetail"] = dtCurrentTable;
                //Bind Gridview with latest Row  
                GridView1.DataSource = dtCurrentTable;
                GridView1.DataBind();
            }
        }
    }

protected void btAgregaT_Click(object sender, EventArgs e)
{
    AddNewRecordRowToGrid();  
}

就你而言：

protected void btAgregaT_Click(object sender, EventArgs e)
{
    //cloning the table row
    DataRow t = tablaPed.NewRow();

    //adding data to row
    t["SrNo"] = "1";
    t["EmailId"] = "test@gmail.com";
    t["Password"] = "Password";

    //adding row to table
    tablaPed.Rows.Add(t);    

}

更新2: 基本上，您需要使用ViewState来管理一切。下面我还提到了添加，简单地说，您可以从ViewState添加、编辑、删除记录，并将它们绑定到gridview

protected void Page_Load(object sender, EventArgs e)
    {
        try
        {
            //Adding data to datatable
            DataRow t = tablaPed.NewRow();

            //adding data to row
            t["SrNo"] = "1";
            t["EmailId"] = "test@gmail.com";
            t["Password"] = "Password";

            //adding row to table
            tablaPed.Rows.Add(t);

            //saving databale into viewstate   
            ViewState["UserDetail"] = t;

            //bind Gridview  
            GridView1.DataSource = t;
            GridView1.DataBind(); 
        }
    }

下面是单击“添加”按钮时要调用的函数：

private void AddNewRecordRowToGrid()
    {
        // check view state is not null  
        if (ViewState["UserDetail"] != null)
        {
            //get datatable from view state   
            DataTable dtCurrentTable = (DataTable)ViewState["UserDetail"];
            DataRow drCurrentRow = null;

            if (dtCurrentTable.Rows.Count > 0)
            {
                //this will add previously added entries 
                for (int i = 1; i <= dtCurrentTable.Rows.Count; i++)
                {

                    //add each row into data table  
                    drCurrentRow = dtCurrentTable.NewRow();
                    //you can add data from textbox or other user control
                    drCurrentRow["SrNo"] = "2";
                    drCurrentRow["EmailId"] = "test@gmail.com";
                    drCurrentRow["Password"] = "Password";

                }
                //Remove initial blank row  
                if (dtCurrentTable.Rows[0][0].ToString() == "")
                {
                    dtCurrentTable.Rows[0].Delete();
                    dtCurrentTable.AcceptChanges();

                }

                //add created Rows into dataTable  
                dtCurrentTable.Rows.Add(drCurrentRow);
                //Save Data table into view state after creating each row  
                ViewState["UserDetail"] = dtCurrentTable;
                //Bind Gridview with latest Row  
                GridView1.DataSource = dtCurrentTable;
                GridView1.DataBind();
            }
        }
    }

protected void btAgregaT_Click(object sender, EventArgs e)
{
    AddNewRecordRowToGrid();  
}

就你而言：

protected void btAgregaT_Click(object sender, EventArgs e)
{
    //cloning the table row
    DataRow t = tablaPed.NewRow();

    //adding data to row
    t["SrNo"] = "1";
    t["EmailId"] = "test@gmail.com";
    t["Password"] = "Password";

    //adding row to table
    tablaPed.Rows.Add(t);    

}

---

DataRow

的对象不能是新的，它应该是指您已经全局拥有的数据表

protected void btAgregaT_Click(object sender, EventArgs e)
{
    TableRow t = tablaPed.TableRow();

    TableCell c = new TableCell();
    c.Text = DDLArticulos.SelectedItem.ToString();
    t.Cells.Add(c);

    TableCell c2 = new TableCell();
    c2.Text = TBCantidad.Text;
    t.Cells.Add(c2);

    tablaPed.Rows.Add(t);  
}

---

此外，如果在添加新项之前为dataTable调用了

refresh（）

或

clear（）

方法，请检查代码。如果确实找到了某个对象，请对其进行注释，然后尝试执行。

数据行的对象不能是新的，它应该引用全局已有的数据表

protected void btAgregaT_Click(object sender, EventArgs e)
{
    TableRow t = tablaPed.TableRow();

    TableCell c = new TableCell();
    c.Text = DDLArticulos.SelectedItem.ToString();
    t.Cells.Add(c);

    TableCell c2 = new TableCell();
    c2.Text = TBCantidad.Text;
    t.Cells.Add(c2);

    tablaPed.Rows.Add(t);  
}

---

此外，如果在添加新项之前为dataTable调用了

refresh（）

或

clear（）

方法，请检查代码。如果确实找到了某个内容，请对其进行注释，然后尝试执行。

tablaPed的类型是

DataTable

tablaPed.Rows.Add（DDLArticulos.SelectedItem.ToString（），TBCantidad.Text）

tablaPed的类型是

DataTable

tablaPed.Rows.Add（DDLArticulos.SelectedItem.ToString（），TBCantidad.Text）您好，谢谢您的帮助，但问题是当我单击按钮（它位于网页中）时，它只添加一行，并且每次单击按钮时都会覆盖它。完美，ViewState和会话之间有什么区别？我也可以使用它吗？当然，存储在会话变量中的数据将保留整个用户会话，而viewstate将仅保留该页面：）。如果我有帮助的话，别忘了投票。嗨，谢谢你的帮助，但问题是当我点击按钮（它在网页中）时，它只添加了一行，并且每次点击按钮都会覆盖它。完美，ViewState和会话之间有什么区别？我也可以使用它吗？当然，存储在会话变量中的数据将保留整个用户会话，而viewstate将仅保留该页面：）。如果我有什么帮助，别忘了投票。