DataGridView怎样实现添加、删除、上移、下移一行

分手后的思念是犯贱 2023-10-11 00:50 43阅读 0赞

## 场景 ##

在Winform中使用DataGridView实现添加一行、删除一行、上移一行、下移一行。

注：

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## 实现 ##

### 添加一行 ###

private void TaskViewEditHelper_OnAddStep(object sender, EventArgs e)
            {
              
                DataGridViewRow dr = new DataGridViewRow();
                dr.CreateCells(this.dataGridView_Task_ViewEdit);
                dr.Cells[0].Value = "公众号" + this.dataGridView_Task_ViewEdit.Rows.Count;
                dr.Cells[1].Value = "霸道的程序猿";
                dr.Cells[2].Value = "大量编程教程与资源";
                //this.dataGridView_Task_ViewEdit.Rows.Insert(0, dr);    //添加的行作为第一行
                this.dataGridView_Task_ViewEdit.Rows.Add(dr);//添加的行作为最后一行
            }

### 效果 ###

![20191030103146543.gif][]

### 删除一行 ###

private void TaskViewEditHelper_OnRemoveStep(object sender, EventArgs e)
            {
                if (this.dataGridView_Task_ViewEdit.SelectedRows == null || this.dataGridView_Task_ViewEdit.SelectedRows.Count == 0)
                {
                    XtraMessageBox.Show("请先选择删除步，单击第一列以选中行");
                }
                else
                {
                    if (XtraMessageBox.Show("确定要删除选中步吗？") == System.Windows.Forms.DialogResult.OK)
                    {
                        foreach (DataGridViewRow dr in this.dataGridView_Task_ViewEdit.SelectedRows)
                        {
                            if (dr.IsNewRow == false)
                            {
                                //如果不是已提交的行，默认情况下在添加一行数据成功后，DataGridView为新建一行作为新数据的插入位置
                                this.dataGridView_Task_ViewEdit.Rows.Remove(dr);
                            }
                        }
                    }
                }
            }

### 效果 ###

![20191030103207145.gif][]

### 上移一行 ###

private void TaskViewEditHelper_OnUpStep(object sender, EventArgs e)
            {
              
                if (this.dataGridView_Task_ViewEdit.SelectedRows == null || this.dataGridView_Task_ViewEdit.SelectedRows.Count == 0)
                {
                    XtraMessageBox.Show("请先选择一行，单击第一列以选中行");
                }
                else
                {
                    if (this.dataGridView_Task_ViewEdit.SelectedRows[0].Index <= 0)
                    {
                        XtraMessageBox.Show("此行已在顶端，不能再上移！");
                    }
                    else
                    {
                        //注意：这里是非绑定数据情况的上移行
                        // 选择的行号  
                        int selectedRowIndex = GetSelectedRowIndex(this.dataGridView_Task_ViewEdit);
                        if (selectedRowIndex >= 1)
                        {
                            // 拷贝选中的行  
                            DataGridViewRow newRow = dataGridView_Task_ViewEdit.Rows[selectedRowIndex];
                            // 删除选中的行  
                            dataGridView_Task_ViewEdit.Rows.Remove(dataGridView_Task_ViewEdit.Rows[selectedRowIndex]);
                            // 将拷贝的行，插入到选中的上一行位置  
                            dataGridView_Task_ViewEdit.Rows.Insert(selectedRowIndex - 1, newRow);
                            dataGridView_Task_ViewEdit.ClearSelection();
                            // 选中最初选中的行 
                            dataGridView_Task_ViewEdit.Rows[selectedRowIndex - 1].Selected = true;
                        }
                    }
                }
            }

注：

这里是没绑定数据源情况下的上移一行，添加的一行时通过是上面新增的方法实现的。

此时dataGridView的dataSource是为空的。

其中用到获取选中行的方法：

private int GetSelectedRowIndex(DataGridView dgv)
            {
                if (dgv.Rows.Count == 0)
                {
                    return 0;
                }
                foreach (DataGridViewRow row in dgv.Rows)
                {
                    if (row.Selected)
                    {
                        return row.Index;
                    }
                }
                return 0;
            }

### 效果 ###

![2019103010324196.gif][]

### 下移一行 ###

private void TaskViewEditHelper_OnDownStep(object sender, EventArgs e)
            {
                if (this.dataGridView_Task_ViewEdit.SelectedRows == null || this.dataGridView_Task_ViewEdit.SelectedRows.Count == 0)
                {
                    XtraMessageBox.Show("请先选择一行，单击第一列以选中行");
                }
                else
                {
                    if (this.dataGridView_Task_ViewEdit.SelectedRows[0].Index >= this.dataGridView_Task_ViewEdit.Rows.Count - 1)
                    {
                        XtraMessageBox.Show("此行已在底端，不能再下移！");
                    }
                    else
                    {
                        int selectedRowIndex = GetSelectedRowIndex(this.dataGridView_Task_ViewEdit);
                        if (selectedRowIndex < dataGridView_Task_ViewEdit.Rows.Count - 1)
                        {
                            // 拷贝选中的行  
                            DataGridViewRow newRow = dataGridView_Task_ViewEdit.Rows[selectedRowIndex];
                            // 删除选中的行  
                            dataGridView_Task_ViewEdit.Rows.Remove(dataGridView_Task_ViewEdit.Rows[selectedRowIndex]);
                            // 将拷贝的行，插入到选中的下一行位置  
                            dataGridView_Task_ViewEdit.Rows.Insert(selectedRowIndex + 1, newRow);
                            dataGridView_Task_ViewEdit.ClearSelection();
                            // 选中最初选中的行  
                            dataGridView_Task_ViewEdit.Rows[selectedRowIndex + 1].Selected = true;
                        }
                    }
                }
              
            }

### 效果 ###

![20191030103256236.gif][]

[https_blog.csdn.net_badao_liumang_qizhi]: https://blog.csdn.net/badao_liumang_qizhi
[20191030103146543.gif]: https://img-blog.csdnimg.cn/20191030103146543.gif
[20191030103207145.gif]: https://img-blog.csdnimg.cn/20191030103207145.gif
[2019103010324196.gif]: https://img-blog.csdnimg.cn/2019103010324196.gif
[20191030103256236.gif]: https://img-blog.csdnimg.cn/20191030103256236.gif