子窗口窗体在 gridview 上不显示配色方案

Question

我设计了一个表单，它在 datagridview（交替行）上显示配色方案。它工作正常。但是当我从 mdi 父表单菜单条选项卡中调用它时，它不会在 datagridview 上显示颜色（填充表单加载功能）。当我只运行子表单时，它会在 gridview3 和 datagridview4 上显示颜色。像

但是当我从父级调用时，它不会在 datagridview3（备用行）和 datagridview4（备用行）中显示颜色。 看起来像

private void Form1_Load(object sender, EventArgs e)
{
    comboBox1.SelectedItem = "Select Gender";

    using (SqlConnection con = new SqlConnection(conn))
    {

        SqlDataAdapter sda = new SqlDataAdapter("getdata", con);
        sda.SelectCommand.CommandType = CommandType.StoredProcedure;
        DataSet ds = new DataSet();
        sda.Fill(ds);
        ds.Tables[0].TableName = "Product";
        ds.Tables[1].TableName = "Category";

        dataGridView3.DataSource = ds.Tables["Product"];
        dataGridView4.DataSource = ds.Tables["Category"];


    }
    gridrowcolor();


}
public void gridrowcolor()
{
    DataGridViewCellStyle st = new DataGridViewCellStyle();
    st.Font = new Font("Arial", 12, FontStyle.Bold);

    for (int i = 0; i < dataGridView4.Rows.Count-1; i++)
    {
        //dataGridView4.RowsDefaultCellStyle.BackColor = Color.Orange;
        //dataGridView4.AlternatingRowsDefaultCellStyle.BackColor = Color.BurlyWood;

        int ii = Convert.ToInt32(dataGridView4.Rows[i].Cells[0].Value.ToString());
        if (ii % 2 == 0)
        {
            dataGridView4.Rows[i].DefaultCellStyle.BackColor = Color.Gray;
            dataGridView4.Rows[i].DefaultCellStyle = st;
        }
        else
            dataGridView4.Rows[i].DefaultCellStyle.BackColor = Color.Brown;
    }

    for (int i = 0; i < dataGridView3.Rows.Count - 1; i++)
    {


        dataGridView3.CellBorderStyle = DataGridViewCellBorderStyle.None;
        DataGridViewCellStyle style = new DataGridViewCellStyle();
        style.Font = new Font(dataGridView3.Font, FontStyle.Bold);

        int ii = Convert.ToInt32(dataGridView3.Rows[i].Cells[0].Value.ToString());
        if (ii % 2 == 0)
        {
            dataGridView3.Rows[i].DefaultCellStyle.BackColor = Color.Yellow;
            dataGridView3.Rows[i].DefaultCellStyle = style;
            dataGridView3.DefaultCellStyle.SelectionForeColor = Color.Chocolate;
        }
        else
            dataGridView3.Rows[i].DefaultCellStyle.BackColor = Color.Orange;
    }
}


 From Parent MDI Form

private void receiptCancelRequestToolStripMenuItem_Click(object sender, EventArgs e)
{
    Form1 frm = new Form1();
    frm.MdiParent = this;
    frm.Show();

}

Answer 1

假设您已经发布了 ChildForm 的代码，并且您的应用程序设置为 MDI 父级，并且您有数据。您应该使用调用 gridrowcolor(); 的 DataGridViews 的 OnBindingComplete 事件；从那里。这应该可以。

    Form1_Load()
    {

    dataGridView4.OnBindingComplete += SetGridViewRows;
    ... // the rest of your code...

    }

SetGridViewRows(object sender, BindingCompleteEventArgs e)
{

    DataGridViewCellStyle st = new DataGridViewCellStyle();
    st.Font = new Font("Arial", 12, FontStyle.Bold);

    for (int i = 0; i < dataGridView4.Rows.Count-1; i++)
    {
        //dataGridView4.RowsDefaultCellStyle.BackColor = Color.Orange;
        //dataGridView4.AlternatingRowsDefaultCellStyle.BackColor = Color.BurlyWood;

        int ii = Convert.ToInt32(dataGridView4.Rows[i].Cells[0].Value.ToString());
        if (ii % 2 == 0)
        {
            dataGridView4.Rows[i].DefaultCellStyle.BackColor = Color.Gray;
            dataGridView4.Rows[i].DefaultCellStyle = st;
        }
        else
            dataGridView4.Rows[i].DefaultCellStyle.BackColor = Color.Brown;
    }


}

上面的代码——为了简洁起见，我复制了——你实际上可以使用相同的事件——只使用 sender 和 eventargs 来达到你的目的。 使用 CellFormatEvent - 我不推荐，因为该方法可能会被调用两次，具体取决于您在做什么。 使用 DataGridView 的 BindingCompleteEvent 应该没有问题。

编辑 好的，我为你写了代码：

Form1_Load()
{
    // This method subscribes to the DataGridView Binding Complete Event. Only after DdataBinding is Complete
        // For example when you do this dataGridView3.DataSource = MySource; or dataGridView3.ResetBindings(false);
       dataGridView3.DataBindingComplete += dataGridView3_DataBindingComplete;

       // This Method Subscribes to the Cell Formatting event - will be called when formatting the Cells!
    dataGridView3.CellFormatting += new DataGridViewCellFormattingEventHandler(dataGridView3_CellFormatting);

// All of my other code that I have in the load event..

}

// This is called when Databinding is complete 
        private void dataGridView3_DataBindingComplete(object sender, DataGridViewBindingCompleteEventArgs e)
        {
            dgBinContent.ClearSelection();

            DataGridView myGrid = (DataGridView)sender;
            for (int i = 0; i < myGrid.Rows.Count - 1; i++)
            {


                myGrid.CellBorderStyle = DataGridViewCellBorderStyle.None;
                DataGridViewCellStyle style = new DataGridViewCellStyle();
                style.Font = new System.Drawing.Font(myGrid.Font, System.Drawing.FontStyle.Bold);

                int ii = Convert.ToInt32(myGrid.Rows[i].Cells[0].Value.ToString());
                if (ii % 2 == 0)
                {
                    myGrid.Rows[i].DefaultCellStyle.BackColor = System.Drawing.Color.Yellow;
                    myGrid.Rows[i].DefaultCellStyle = style;
                    myGrid.DefaultCellStyle.SelectionForeColor = System.Drawing.Color.Chocolate;
                }
                else
        {
                    myGrid.Rows[i].DefaultCellStyle.BackColor = System.Drawing.Color.Orange;
        }
            }

         }

// This is called when Cell Formatting
        void dataGridView3_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
        {
            this.dataGridView3.Rows[e.RowIndex].HeaderCell.Value = String.Format("{0}", e.RowIndex + 1);

            dataGridView3.CellBorderStyle = DataGridViewCellBorderStyle.None;
            DataGridViewCellStyle style = new DataGridViewCellStyle();
            style.Font = new System.Drawing.Font(dataGridView3.Font, System.Drawing.FontStyle.Bold);

            int ii = Convert.ToInt32(dataGridView3.Rows[e.RowIndex].Cells[0].Value.ToString());
            if (ii % 2 == 0)
            {
                dataGridView3.Rows[e.RowIndex].DefaultCellStyle.BackColor = System.Drawing.Color.Yellow;
                dataGridView3.Rows[e.RowIndex].DefaultCellStyle = style;
                dataGridView3.DefaultCellStyle.SelectionForeColor = System.Drawing.Color.Chocolate;
            }
            else
            {
                dataGridView3.Rows[e.RowIndex].DefaultCellStyle.BackColor = System.Drawing.Color.Orange;
            }

        }