场景和http://arsalantamiz.blogspot.com/2008/09/binding-datagridview-combobox-column.html几乎一样.但我无法让它在 c# 上工作...
我的 mySql 数据库有两个表: 1. 协议(protocol) 2.pcap数据
在协议(protocol)表中我有两个字段:idprotocols 和 protocolName
在 pcaps 表中我有 wizardProtocol(“链接”到 idprotocols 字段)
我想要得到的是有一个组合框,其中包含将替换 wizardprotocol 字段的名称。接下来,如果用户更新“名称”组合框,wizardProtocol 将相应更改(因此我将能够相应地更新数据库中的更改)。
现在,在网上看了一些资料:我写了下面的代码:
public void Bind(ref DataGridView dataGridView)
{
try
{
mySqlDataAdapter = new MySqlDataAdapter(SELECT_ALL_PCAP, _con);
mySqlCommandBuilder = new MySqlCommandBuilder(mySqlDataAdapter);
mySqlDataAdapter.UpdateCommand = mySqlCommandBuilder.GetUpdateCommand();
mySqlDataAdapter.DeleteCommand = mySqlCommandBuilder.GetDeleteCommand();
mySqlDataAdapter.InsertCommand = mySqlCommandBuilder.GetInsertCommand();
dataSet = new DataSet();
mySqlDataAdapter.Fill(dataSet, "pcap");
MySqlDataAdapter adp2 = new MySqlDataAdapter(SELECT_ALL_PROTOCOL, _con);
MySqlCommandBuilder builder = new MySqlCommandBuilder(adp2);
adp2.UpdateCommand = builder.GetUpdateCommand();
adp2.DeleteCommand = builder.GetDeleteCommand();
adp2.InsertCommand = builder.GetInsertCommand();
adp2.Fill(dataSet, "protocol");
bindingSource = new BindingSource();
bindingSource.DataSource = dataSet;
bindingSource.DataMember = "pcap";
dataGridView.DataSource = bindingSource;
dataGridView.Columns["length"].ReadOnly = true;
dataGridView.Columns["length"].DefaultCellStyle.ForeColor = System.Drawing.Color.SandyBrown;
dataGridView.AllowUserToAddRows = false;
dataGridView.AllowUserToDeleteRows = false;
DataGridViewComboBoxColumn colType = new DataGridViewComboBoxColumn();
colType.HeaderText = "Type";
colType.DropDownWidth = 90;
colType.Width = 90;
colType.DataPropertyName = "wizardProtocol";
colType.DataSource = bindingSource;
colType.DisplayMember = "protocolName";
colType.ValueMember = "idprotocols";
dataGridView.Columns.Insert(dataGridView.Columns.GetColumnCount(DataGridViewElementStates.None) - 1, colType);
}
catch (System.Exception e)
{
MessageBox.Show(e.ToString());
}
}
我正在尝试操纵 DisplayMember 属性,但我失败了(我知道问题可能出在我的数据绑定(bind)上,但我想不通...)
更新:感谢回答,我重新附上固定代码
mySqlDataAdapter = new MySqlDataAdapter(SELECT_ALL_PCAP, _con);
mySqlCommandBuilder = new MySqlCommandBuilder(mySqlDataAdapter);
mySqlDataAdapter.UpdateCommand = mySqlCommandBuilder.GetUpdateCommand();
mySqlDataAdapter.DeleteCommand = mySqlCommandBuilder.GetDeleteCommand();
mySqlDataAdapter.InsertCommand = mySqlCommandBuilder.GetInsertCommand();
dataSet = new DataSet();
mySqlDataAdapter.Fill(dataSet, "pcap");
MySqlDataAdapter adp2 = new MySqlDataAdapter(SELECT_ALL_PROTOCOL, _con);
MySqlCommandBuilder builder = new MySqlCommandBuilder(adp2);
adp2.UpdateCommand = builder.GetUpdateCommand();
adp2.DeleteCommand = builder.GetDeleteCommand();
adp2.InsertCommand = builder.GetInsertCommand();
adp2.Fill(dataSet, "protocol");
bindingSource = new BindingSource();
bindingSource.DataSource = dataSet;
bindingSource.DataMember = "pcap";
dataGridView.DataSource = bindingSource;
dataGridView.AllowUserToAddRows = false;
dataGridView.AllowUserToDeleteRows = false;
DataGridViewComboBoxColumn colType = new DataGridViewComboBoxColumn();
BindingSource wizardBindingSource = new BindingSource();
wizardBindingSource.DataSource = dataSet;
wizardBindingSource.DataMember = "protocol";
colType.HeaderText = "Type";
colType.DropDownWidth = 90;
colType.Width = 90;
colType.DataPropertyName = "wizardProtocol";
colType.DataSource = wizardBindingSource;
colType.DisplayMember = "protocolName";
colType.ValueMember = "idprotocols";
dataGridView.Columns.Insert(dataGridView.Columns.GetColumnCount(DataGridViewElementStates.None) - 1, colType);
最佳答案
您做错的最明显的事情是您对 datagridview 和 comboboxcolumn 使用相同的绑定(bind)源。如果查看您提供的示例,您会注意到它们创建了第二个绑定(bind)源 productBindingSource。
因此,您需要做的是创建一个绑定(bind)源(我们称它为 wizardProtocolBindingSource),然后用协议(protocol)表中的数据填充它。这将成为您的组合框列的数据源。
关键代码看起来像这样:
// You bind the datagridview just as before
// this dataset should have the idprotocols field which is your foreign key
// to the protocols table - you will probably want this to be hidden.
bindingSource = new BindingSource();
bindingSource.DataSource = dataSet;
bindingSource.DataMember = "pcap";
dataGridView.DataSource = bindingSource;
// hide the foreign key column
dataGridView.Columns["idProtocols"].Visible = false;
// here we populate your comboboxcolumn binding source
wizardProtocolBindingSource= new BindingSource();
// this dataset is from the protocols table
wizardProtocolBindingSource.DataSource = dataSet;
// Add the combobox column
DataGridViewComboBoxColumn colType = new DataGridViewComboBoxColumn();
colType.HeaderText = "Type";
colType.DropDownWidth = 90;
colType.Width = 90;
colType.DataSource = wizardProtocolBindingSource;
// The DataPropertyName refers to the foreign key column on the datagridview datasource
colType.DataPropertyName = "wizardProtocol";
// The display member is the name column in the column datasource
colType.DisplayMember = "protocolName";
// The value member is the primary key of the protols table
colType.ValueMember = "idprotocols";
// I usually just add the column but you can insert if you need a particular position
dataGridView.Columns.Add(colType);
以上应该对你有用,虽然我不知道你的数据集列的名称我不得不猜测一点。
关于c# - 将绑定(bind)的组合框添加到数据 GridView ,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/7582705/