c# - c# Grid View 将行数设置回1

Question

我在这里有这段代码：

private void SetInitialRow()
    {
        DataTable dt = new DataTable();
        DataRow dr = null;
        dt.Columns.Add(new DataColumn("Question", typeof(string)));
        dt.Columns.Add(new DataColumn("Answer", typeof(string)));

        dr = dt.NewRow();
        dr["Question"] = string.Empty;
        dr["Answer"] = string.Empty;


        dt.Rows.Add(dr);


        //Store the DataTable in ViewState
        ViewState["CurrentTable"] = dt;

        GridView1.DataSource = dt;
        GridView1.DataBind();
    }

    private void AddNewRowToGrid()
    {
        int rowIndex = 0;

        if (ViewState["CurrentTable"] != null)
        {
            DataTable dtCurrentTable = (DataTable)ViewState["CurrentTable"];
            DataRow drCurrentRow = null;
            if (dtCurrentTable.Rows.Count > 0)
            {
                for (int i = 1; i <= dtCurrentTable.Rows.Count; i++)
                {
                    //extract the TextBox values
                    TextBox box1 = (TextBox)GridView1.Rows[rowIndex].Cells[1].FindControl("TextBox1");
                    TextBox box2 = (TextBox)GridView1.Rows[rowIndex].Cells[2].FindControl("TextBox2");


                    drCurrentRow = dtCurrentTable.NewRow();


                    dtCurrentTable.Rows[i - 1]["Question"] = box1.Text;
                    dtCurrentTable.Rows[i - 1]["Answer"] = box2.Text;


                    rowIndex++;
                }
                dtCurrentTable.Rows.Add(drCurrentRow);
                ViewState["CurrentTable"] = dtCurrentTable;

                GridView1.DataSource = dtCurrentTable;
                GridView1.DataBind();
            }
        }
        else
        {
            Response.Write("ViewState is null");
        }

      //  Set Previous Data on Postbacks
        SetPreviousData();
    }

    private void SetPreviousData()
    {
        int rowIndex = 0;
        if (ViewState["CurrentTable"] != null)
        {
            DataTable dt = (DataTable)ViewState["CurrentTable"];
            if (dt.Rows.Count > 0)
            {
                for (int i = 0; i < dt.Rows.Count; i++)
                {
                    TextBox box1 = (TextBox)GridView1.Rows[rowIndex].Cells[1].FindControl("TextBox1");
                    TextBox box2 = (TextBox)GridView1.Rows[rowIndex].Cells[2].FindControl("TextBox2");


                    box1.Text = dt.Rows[i]["Question"].ToString();
                    box2.Text = dt.Rows[i]["Answer"].ToString();

                    Session["Question1"] = box1.Text;
                    rowIndex++;
                }
            }
        }
    }

    protected void btnAdd_Click1(object sender, EventArgs e)
    {
        AddNewRowToGrid();

    }

现在我有另一个按钮调用 btnCreate 。我单击添加按钮在 Grid View 中添加行，意味着每次单击都添加一行。单击创建按钮后，我希望行数恢复为一，现在，行将停留在我单击添加按钮的次数，直到我刷新页面。单击创建按钮后，我需要将行数重置为 1。

Answer 1

You can direcly call SetInitialRow() method in your btnCreate click event, that means you are binding a single row to gridview which mean number of rows reseted to 1.

Answer 2

You can add this to the btnAdd_Click1 method:

dtCurrentTable.Rows(1).Selected = True

Answer 3

我已经尝试过您的相同代码，它适用于我的。

---

像这样。

protected void Page_Load(object sender, EventArgs e)
    {
        SetInitialRow();
    }
    private void SetInitialRow()
    {
        DataTable dt = new DataTable();
        DataRow dr = null;
        dt.Columns.Add(new DataColumn("Question", typeof(string)));
        dt.Columns.Add(new DataColumn("Answer", typeof(string)));
        dr = dt.NewRow();
        dr["Question"] = string.Empty;
        dr["Answer"] = string.Empty;
        dt.Rows.Add(dr);
        //Store the DataTable in ViewState
        ViewState["CurrentTable"] = dt;
        GridView1.DataSource = dt;
        GridView1.DataBind();
    }
    private void AddNewRowToGrid()
    {
        int rowIndex = 0;
        if (ViewState["CurrentTable"] != null)
        {
            DataTable dtCurrentTable = (DataTable)ViewState["CurrentTable"];
            DataRow drCurrentRow = null;
            if (dtCurrentTable.Rows.Count > 0)
            {
                for (int i = 1; i <= dtCurrentTable.Rows.Count; i++)
                {
                    //extract the TextBox values
                    TextBox box1 = (TextBox)GridView1.Rows[i].FindControl("TextBox1");
                    TextBox box2 = (TextBox)GridView1.Rows[i].FindControl("TextBox2");
                    drCurrentRow = dtCurrentTable.NewRow();
                    dtCurrentTable.Rows[i - 1]["Question"] = box1.Text;
                    dtCurrentTable.Rows[i - 1]["Answer"] = box2.Text;
                    rowIndex++;
                }
                dtCurrentTable.Rows.Add(drCurrentRow);
                ViewState["CurrentTable"] = dtCurrentTable;

                GridView1.DataSource = dtCurrentTable;
                GridView1.DataBind();
            }
        }
        else
        {
            Response.Write("ViewState is null");
        }
        //  Set Previous Data on Postbacks
        SetPreviousData();
    }

    private void SetPreviousData()
    {
        int rowIndex = 0;
        if (ViewState["CurrentTable"] != null)
        {
            DataTable dt = (DataTable)ViewState["CurrentTable"];
            if (dt.Rows.Count > 0)
            {
                for (int i = 0; i < dt.Rows.Count; i++)
                {
                    TextBox box1 = (TextBox)GridView1.Rows[rowIndex].FindControl("TextBox1");
                    TextBox box2 = (TextBox)GridView1.Rows[rowIndex].FindControl("TextBox2");
                    box1.Text = dt.Rows[i]["Question"].ToString();
                    box2.Text = dt.Rows[i]["Answer"].ToString();

                    Session["Question1"] = box1.Text;
                    rowIndex++;
                }
            }
        }
    }
    protected void btnAdd_Click(object sender, EventArgs e)
    {
        AddNewRowToGrid();
    }
    protected void prevRow_Click(object sender, EventArgs e)
    {
        SetPreviousData();
    }

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如果我的答案在错误的轨道上，这取决于您的要求，我很抱歉。欢迎评论和询问。谢谢你