选中/取消选中datagridview上的复选框-Java 学习之路

有人可以帮助我为什么它不起作用？我有一个 checkbox ，如果我点击它，这应取消选中datagridview中的所有复选框，这些复选框在包括用户选中复选框之前已经过检查 .

这是代码：

private void chkItems_CheckedChanged(object sender, EventArgs e)
        {
            foreach (DataGridViewRow row in datagridview1.Rows)
            {
                DataGridViewCheckBoxCell chk = (DataGridViewCheckBoxCell)row.Cells[1];
                if (chk.Selected == true)
                {
                    chk.Selected = false;
                }
                else
                {
                    chk.Selected = true;
                }
            }
        }

不应选中该复选框 . 应该检查 .

这是添加的列

DataGridViewCheckBoxColumn CheckboxColumn = new DataGridViewCheckBoxColumn();
            CheckBox chk = new CheckBox();
            CheckboxColumn.Width = 20;
            datagridview1.Columns.Add(CheckboxColumn);

14 回答

所有的铸造都会导致错误，这里我没有尝试过任何工作，所以我摆弄了一下并让它发挥作用 .

foreach (DataGridViewRow row in dataGridView1.Rows)
        {
            if (row.Cells[0].Value != null && (bool)row.Cells[0].Value)
            {
                Console.WriteLine(row.Cells[0].Value);
            }

        }

回复于 2024-04-28T13:03:40+08:00

看看这个MSDN Forum Posting它建议将Cell的值与Cell.TrueValue进行比较 .

因此，通过它的示例，您的代码看起来应该是这样的:(这是完全未经测试的）

编辑：似乎未绑定DataGridViewCheckBox的Cell.TrueValue的默认值为null，您需要在列定义中设置它 .

private void chkItems_CheckedChanged(object sender, EventArgs e)
{
    foreach (DataGridViewRow row in dataGridView1.Rows)
    {
        DataGridViewCheckBoxCell chk = (DataGridViewCheckBoxCell)row.Cells[1];
        if (chk.Value  == chk.TrueValue)
        {
            chk.Value = chk.FalseValue;
        }
        else
        {
            chk.Value = chk.TrueValue;
        }
    }
}

这段代码是工作说明在构造函数中设置TrueValue和FalseValue以及检查null：

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
        DataGridViewCheckBoxColumn CheckboxColumn = new DataGridViewCheckBoxColumn();
        CheckboxColumn.TrueValue = true;
        CheckboxColumn.FalseValue = false;
        CheckboxColumn.Width = 100;
        dataGridView1.Columns.Add(CheckboxColumn);
        dataGridView1.Rows.Add(4);
    }

    private void chkItems_CheckedChanged(object sender, EventArgs e)
    {
        foreach (DataGridViewRow row in dataGridView1.Rows)
        {
            DataGridViewCheckBoxCell chk = (DataGridViewCheckBoxCell)row.Cells[0];
            if (chk.Value == chk.FalseValue || chk.Value == null)
            {
                chk.Value = chk.TrueValue;
            }
            else
            {
                chk.Value = chk.FalseValue;
            }

        }
        dataGridView1.EndEdit();
    }
}

回复于 2024-04-28T13:03:40+08:00

当我看到这篇文章没有真正回答时，我正在制作我自己的Checkbox版本来控制DataGridViewCheckBoxColumn . 要设置DataGridViewCheckBoxCell的已检查状态，请使用：

foreach (DataGridViewRow row in dataGridView1.Rows)
{
    dataGridView1.Rows[row.Index].SetValues(true);
}

对于任何试图完成同样事情的人来说，这就是我想出的 .

这使得两个控件的行为类似于Gmail中的复选框列 . 它保留了鼠标和键盘的功能 .

using System;
using System.Windows.Forms;

namespace Check_UnCheck_All
{
    public partial class Check_UnCheck_All : Form
    {
        public Check_UnCheck_All()
        {
            InitializeComponent();
            dataGridView1.RowCount = 10;
            dataGridView1.AllowUserToAddRows = false;
            this.dataGridView1.CellContentClick += new System.Windows.Forms.DataGridViewCellEventHandler(this.dgvApps_CellContentClick);
            this.dataGridView1.CellMouseUp += new System.Windows.Forms.DataGridViewCellMouseEventHandler(this.myDataGrid_OnCellMouseUp);
            this.dataGridView1.CellValueChanged += new System.Windows.Forms.DataGridViewCellEventHandler(this.myDataGrid_OnCellValueChanged);
            this.checkBox1.Click += new System.EventHandler(this.checkBox1_Click);
        }

        public int chkInt = 0;
        public bool chked = false;

        public void myDataGrid_OnCellValueChanged(object sender, DataGridViewCellEventArgs e)
        {
            if (e.ColumnIndex == dataGridView1.Rows[0].Index && e.RowIndex != -1)
            {
                DataGridViewCheckBoxCell chk = dataGridView1.Rows[e.RowIndex].Cells[0] as DataGridViewCheckBoxCell;

                if (Convert.ToBoolean(chk.Value) == true) chkInt++;
                if (Convert.ToBoolean(chk.Value) == false) chkInt--;
                if (chkInt < dataGridView1.Rows.Count && chkInt > 0)
                {
                    checkBox1.CheckState = CheckState.Indeterminate;
                    chked = true;
                }
                else if (chkInt == 0)
                {
                    checkBox1.CheckState = CheckState.Unchecked;
                    chked = false;
                }
                else if (chkInt == dataGridView1.Rows.Count)
                {
                    checkBox1.CheckState = CheckState.Checked;
                    chked = true;
                }
            }
        }
        public void myDataGrid_OnCellMouseUp(object sender, DataGridViewCellMouseEventArgs e)
        {
            // End of edition on each click on column of checkbox
            if (e.ColumnIndex == dataGridView1.Rows[0].Index && e.RowIndex != -1)
            {
                dataGridView1.EndEdit();
            }
            dataGridView1.BeginEdit(true);
        }
        public void dgvApps_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {
            if (dataGridView1.CurrentCell.GetType() == typeof(DataGridViewCheckBoxCell))
            {
                if (dataGridView1.CurrentCell.IsInEditMode)
                {
                    if (dataGridView1.IsCurrentCellDirty)
                    {
                        dataGridView1.EndEdit();
                    }
                }
                dataGridView1.BeginEdit(true);
            }
        }
        public void checkBox1_Click(object sender, EventArgs e)
        {
            if (chked == true)
            {
                foreach (DataGridViewRow row in dataGridView1.Rows)
                {
                    DataGridViewCheckBoxCell chk = (DataGridViewCheckBoxCell)row.Cells[0];
                    if (chk.Value == chk.TrueValue)
                    {
                        chk.Value = chk.FalseValue;
                    }
                    else
                    {
                        chk.Value = chk.TrueValue;
                    }
                }
                chked = false;
                chkInt = 0;
                return;
            }
            if (chked == false)
            {
                foreach (DataGridViewRow row in dataGridView1.Rows)
                {
                    dataGridView1.Rows[row.Index].SetValues(true);
                }
                chked = true;
                chkInt = dataGridView1.Rows.Count;
            }
        }
    }
}

回复于 2024-04-28T13:03:40+08:00

这是你可以尝试的另一个例子

private void dataGridView_CellContentClick(object sender, DataGridViewCellEventArgs e)
    {
        if (e.ColumnIndex == dataGridView.Columns["Select"].Index)
        {
            dataGridView.EndEdit();

            if ((bool)dataGridView.Rows[e.RowIndex].Cells["Select"].Value)
            {
                //-- checking current select, needs to uncheck any other cells that are checked
                foreach(DataGridViewRow row in dataGridView.Rows)
                {
                    if (row.Index == e.RowIndex)
                    {
                        dataGridView.Rows[row.Index].SetValues(true);
                    }
                    else
                    {
                        dataGridView.Rows[row.Index].SetValues(false);
                    }
                }
            }
        }
    }

回复于 2024-04-28T13:03:40+08:00

3
你在这里尝试的代码将翻转复选框的状态（如果为true，则反之亦然），而不管用户选择的复选框，因为这里 foreach 是 selecting 每个 checkbox 并执行操作 .

为清楚起见，在执行 foreach 操作之前存储 user selected 复选框的 index ，在 foreach 操作之后，通过提及存储的索引并检查它来调用复选框（在您的情况下，将其设为 True - 我认为） .

这只是逻辑，我确定这是正确的 . 如果可能的话，我会尝试实现一些示例代码 .

修改你的 foreach 这样的东西：
```
//Store the index of the selected checkbox here as Integer (you can use e.RowIndex or e.ColumnIndex for it).
    private void chkItems_CheckedChanged(object sender, EventArgs e)
    {
        foreach (DataGridViewRow row in datagridview1.Rows)
        {
            DataGridViewCheckBoxCell chk = (DataGridViewCheckBoxCell)row.Cells[1];
            if (chk.Selected == true)
            {
                chk.Selected = false;
            }
            else
            {
                chk.Selected = true;
            }
        }
    }
    //write the function for checking(making true) the user selected checkbox by calling the stored Index
```
上面的函数使所有复选框都为true，包括用户选择的CheckBox . 我想这就是你想要的......
回复于 2024-04-28T13:03:40+08:00

简单的代码就可以了

private void dgv_CellClick(object sender, DataGridViewCellEventArgs e)
{
    if (dgv.CurrentRow.Cells["ColumnNumber"].Value != null && (bool)dgv.CurrentRow.Cells["ColumnNumber"].Value)
    {
        dgv.CurrentRow.Cells["ColumnNumber"].Value = false;
        dgv.CurrentRow.Cells["ColumnNumber"].Value = null;
    }
    else if (dgv.CurrentRow.Cells["ColumnNumber"].Value == null )
    {
        dgv.CurrentRow.Cells["ColumnNumber"].Value = true;
    }
}

回复于 2024-04-28T13:03:40+08:00

尝试下面应该工作的代码

private void checkBox2_CheckedChanged(object sender, EventArgs e) 
{
    if (checkBox2.Checked == false)
    {
        foreach (DataGridViewRow row in dGV1.Rows)
        {
            DataGridViewCheckBoxCell chk = (DataGridViewCheckBoxCell)row.Cells[0];
            chk.Value = chk.TrueValue;
        }
    }
   else if (checkBox2.Checked == true)
    {
        foreach (DataGridViewRow row in dGV1.Rows)
        {
            DataGridViewCheckBoxCell chk = (DataGridViewCheckBoxCell)row.Cells[0];
            chk.Value = 1;
            if (row.IsNewRow)
            {
                chk.Value = 0;
            }
        }
    }
}

回复于 2024-04-28T13:03:40+08:00

以下代码是完美的

使用复选框CONTROL选择/取消选中数据网格上的复选框列

private void checkBox2_CheckedChanged(object sender, EventArgs e)
    {
        if (checkBox2.Checked == false)
        {
            foreach (DataGridViewRow row in dGV1.Rows)
            {
                DataGridViewCheckBoxCell chk = (DataGridViewCheckBoxCell)row.Cells[0];

                    chk.Value = chk.TrueValue;
            }
       }
       else if(checkBox2.Checked==true)
       {
            foreach (DataGridViewRow row in dGV1.Rows)
            {
                DataGridViewCheckBoxCell chk = (DataGridViewCheckBoxCell)row.Cells[0];
                chk.Value = 1;
                if (row.IsNewRow)
                {
                    chk.Value = 0;
                }
            }
        }
    }

回复于 2024-04-28T13:03:40+08:00

您可以在网格CellClick事件上使用此代码来检查或取消选中单元格复选框：

private void Grid_CellClick(object sender, DataGridViewCellEventArgs e)
    {
        if (e.ColumnIndex == 0)
        {
            Grid.Rows[e.RowIndex].Cells[e.ColumnIndex].Value = (Grid.Rows[e.RowIndex].Cells[e.ColumnIndex].Value == null ? true : (!(bool)Grid.Rows[e.RowIndex].Cells[e.ColumnIndex].Value));
        }
    }

回复于 2024-04-28T13:03:40+08:00

0
虽然所有其他答案都是正确的，但我会添加另一个对我有用的简单选项：
```
var r = dataGridView.Rows[rIndex];
var c = r.Cells[cIndex];
var value = (bool) c.Value; 
c.Value = !value;
```
压缩：
```
var r = dataGridView.Rows[rIndex];
r.Cells[cIndex].Value = !((bool) r.Cells[cIndex].Value)
```
只要 cIndex 指的是 DataGridViewCheckBoxCell 类型的单元格，这将正常工作 . 希望这有助于somone .
回复于 2024-04-28T13:03:40+08:00

你可以试试这段代码：

DataGridViewCheckBoxCell chk = (DataGridViewCheckBoxCell)dataGridView1.CurrentRow.Cells[0];
                dataGridView1.BeginEdit(true);
                if (chk.Value == null || (int)chk.Value == 0)
                {
                    chk.Value = 1;
                }
                else
                {
                    chk.Value = 0;
                }
                dataGridView1.EndEdit();

回复于 2024-04-28T13:03:40+08:00

// here is a simple way to do so

//irate through the gridview
            foreach (DataGridViewRow row in PifGrid.Rows)
            {
//store the cell (which is checkbox cell) in an object
                DataGridViewCheckBoxCell oCell = row.Cells["Check"] as DataGridViewCheckBoxCell;

//check if the checkbox is checked or not
                bool bChecked = (null != oCell && null != oCell.Value && true == (bool)oCell.Value);

//if its checked then uncheck it other wise check it
                if (!bChecked)
                {
                    row.Cells["Check"].Value = true;

                }
                else
                {
                    row.Cells["Check"].Value = false;

                }
            }

回复于 2024-04-28T13:03:40+08:00

0

我遇到了同样的问题，即使这里提供的解决方案也没有用 . 复选框根本不会改变，它们的值将保持为空 . 我花了很多年才意识到自己的愚蠢：

事实证明，在我调用 form1.Show() 之前，我在Form派生类Form1上调用 form1.PopulateDataGridView(my data) . 当我更改顺序时，首先调用 Show() ，然后读取数据并填入复选框，值不会保持为空 .

回复于 2024-04-28T13:03:40+08:00

如果在代码中创建单元格，则下面的代码允许用户取消/检查DataGridView中的复选框

private void gvData_CellClick(object sender, DataGridViewCellEventArgs e)
{
    DataGridViewCheckBoxCell chk = (DataGridViewCheckBoxCell)gvData.Rows[e.RowIndex].Cells[0];

    if (chk.Value == chk.TrueValue)
    {
        gvData.Rows[e.RowIndex].Cells[0].Value = chk.FalseValue;
    }
    else
    {
        gvData.Rows[e.RowIndex].Cells[0].Value = chk.TrueValue;
    }

}

回复于 2024-04-28T13:03:40+08:00

选中/取消选中datagridview上的复选框

14 回答

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