关于datagridview中checkbox列在选中行的情况下无法操作值

这几天做项目的时候碰到了个小问题，在datagridview中实现对checkbox列的全选和反选功能。代码如下

//全选

if (dataGridView1.Rows.Count > 0)

foreach (DataGridViewRow dgvr in dataGridView1.Rows)

{

(dgvr.Cells["checkbox列名称"] as DataGridViewCheckBoxCell).Value = true;

}

//反选

if(dataGridView1.Rows.Count>0)

foreach (DataGridViewRow dgvr in dataGridView1.Rows)

{

(dgvr.Cells[" checkbox列名称 "] as DataGridViewCheckBoxCell).Value = (bool)((dgvr.Cells["DeleteFile"] as DataGridViewCheckBoxCell).Value) ? false : true;

}

发现个问题就是在datagridview选中的那一行上checkbox的值并没有改变。经baidu和google了一下，发现在代码改变状态前，使其readonly变为true就能解决。原理不得而知，先记下来吧！改进后的代码如下：

//全选

if (dataGridView1.Rows.Count > 0)

foreach (DataGridViewRow dgvr in dataGridView1.Rows)

{

(dgvr.Cells[" checkbox列名称 "] as DataGridViewCheckBoxCell).ReadOnly = true;

(dgvr.Cells["checkbox列名称"] as DataGridViewCheckBoxCell).Value = true;

(dgvr.Cells[" checkbox列名称 "] as DataGridViewCheckBoxCell).ReadOnly = false;

}

//反选

if(dataGridView1.Rows.Count>0)

foreach (DataGridViewRow dgvr in dataGridView1.Rows)

{

(dgvr.Cells[" checkbox列名称 "] as DataGridViewCheckBoxCell).ReadOnly = true;

(dgvr.Cells[" checkbox列名称 "] as DataGridViewCheckBoxCell).Value = (bool)((dgvr.Cells["DeleteFile"] as DataGridViewCheckBoxCell).Value) ? false : true;

(dgvr.Cells[" checkbox列名称 "] as DataGridViewCheckBoxCell).ReadOnly = false;

}