如何确定DataGridView中的特定列是否在Windows窗体中冻结？ [英] How to determine if a particular column in a DataGridView is frozen in windows forms ?

问题描述

亲爱的专业人士，



我已经实现了从 DataGridView 继承的自定义控件在我的项目中使用的所有DataGridView都有一些共同的属性和方法。



在这个控件类中，我有一个方法，当按下Enter键时设置DataGridView的currentcell。在这个阶段，我想检查我下一步要移动的列是否被冻结，以确定我的下一步行动。



我已经以编程方式创建了数据表和将它设置为DataGridView的数据源并设置一些列来冻结。

Dear Professionals,

I've implemented a Custom Control inheriting from DataGridView for the purpose of having certain common properties and methods for all DataGridViews used throughout my project.

In this control class, I have a method which sets the DataGridView's currentcell when Enter key is pressed. At this stage I want to check if the column to which I have to move next is frozen or not to decide my next move.

I have programmatically created the datatable and set it as the datasource to the DataGridView and have set some columns to freeze.

DataTable dtkotitems = new DataTable();
dtkotitems.Columns.Add("Sl.No", typeof(int));
dtkotitems.Columns.Add("Code", typeof(String));
dtkotitems.Columns.Add("Item Description", typeof(String));
dtkotitems.Columns.Add("Dispersal", typeof(String));
dtkotitems.Columns.Add("Rate", typeof(Double));
dtkotitems.Columns.Add("Qty.", typeof(Double));
dtkotitems.Columns.Add("Amount", typeof(Double));

dtkotitems.Rows.Add(1, "", "", "", 0.00, 0.00, 0.00);

grdKotItems.DataSource = dtkotitems;

grdKotItems.Columns[0].DefaultCellStyle.BackColor = Color.Beige;

grdKotItems.Columns[0].Width = 60;
grdKotItems.Columns[1].Width = 80;
grdKotItems.Columns[2].Width = 350;
grdKotItems.Columns[3].Width = 100;
grdKotItems.Columns[4].Width = 90;
grdKotItems.Columns[5].Width = 90;
grdKotItems.Columns[6].Width = 175;

grdKotItems.Enabled = true;

grdKotItems.Columns[0].Frozen = true;
grdKotItems.Columns[1].Frozen = false;
grdKotItems.Columns[2].Frozen = true;
grdKotItems.Columns[3].Frozen = true;
grdKotItems.Columns[4].Frozen = true;
grdKotItems.Columns[5].Frozen = false;
grdKotItems.Columns[6].Frozen = true;

grdKotItems.CurrentCell = grdKotItems.Rows[0].Cells[1];

在上面的代码片段中，列[1]和列[5]不是冻结。



在我的控制类方法中，我按下输入键时使用下面的代码来检查列是否被冻结以确定下一步。

In the above code snippet the Columns[1] and Columns[5] are not frozen.

In my control class method I am using the below code on press of the 'Enter' Key to check if the column is frozen to determine the next move.

protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
{
    TraverseGrid(keyData);
    return base.ProcessCmdKey(ref msg, keyData);
}

void TraverseGrid(Keys KeyPressedInGridView)
{
    Int32 row = grdKotItems.CurrentCell.RowIndex;
    Int32 col = grdKotItems.CurrentCell.ColumnIndex;

    if (KeyPressedInGridView == Keys.Enter)
    {
        if (col == grdKotItems.Columns.Count - 1)
        {
            row += 1;
            dtkotitems.Rows.Add(row + 1, "", "", "", 0.00, 0.00, 0.00);
            col = 1;
        }
        else
        {
           for (int mi = col + 1; mi < grdKotItems.Columns.Count; mi++)
            {
                if (grdKotItems.Columns[mi].Frozen == false)
                {
                    col = mi;
                    break;
                }
            }
        }
        grdKotItems.CurrentCell = grdKotItems.Rows[row].Cells[col];
    }
}

带下划线的代码始终返回true。我不知道我哪里出错了。请帮忙。

The underlined code always returns true. I have no idea where Iam going wrong. Kindly help.

推荐答案

我不确定是因为我正在使用我的手机，但似乎你会迭代所有的colun，直到找到一个Frozen专栏，而不仅仅是当前的。

I'm not sure due I'm using my phone, but it seems you iterates all the colunns until you find a Frozen column, not just the current one.

grdKotItems.Columns[0].Frozen = true;
grdKotItems.Columns[1].Frozen = false;
grdKotItems.Columns[2].Frozen = true;
grdKotItems.Columns[3].Frozen = true;
grdKotItems.Columns[4].Frozen = true;
grdKotItems.Columns[5].Frozen = false;
grdKotItems.Columns[6].Frozen = true;

在本节中，我想您只想冻结第0,2,3,4,6列，但是不可能的。如果你回过头来查看Frozen属性的文档，它会说



当一个列被冻结时，它左边的所有列（或者它的左边）从右到左的语言也被冻结。



代码的整体效果是将所有列冻结到包括列6.单行代码

With this section I think you wanted to freeze just the columns 0,2,3,4,6 but that is not possible. If you go back and look at the documentation for the Frozen property it says

When a column is frozen, all the columns to its left (or to its right in right-to-left languages) are frozen as well.

The overall effect of your code is to freeze all columns up to and including column 6. A single line of code

grdKotItems.Columns[6].Frozen = true;

会产生同样的效果。



Alan。

would have had the same effect.

Alan.

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