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假设我有两张桌子：

 work_hours
 work_hours_id | date  | _project_id
     1            1.2.      10
     2            1.2.      11
     3            1.2.      10 

 project
 project_id | project_name
    10           pr1
    11           pr2
    12           pr3

在 DataGridView 我想看到这个：

 work_hours_id | date | _person_id | project_name(DataGridViewComboBoxColumn)
     1            1.2.     10            pr1
     2            1.2.     11            pr2
     3            1.2.     10            pr1

1.我该怎么做？ 2.work_hours如果我将 pr1 ( work_hours_id = 3) 更改为 pr3 ( DataGridViewComboBoxColumn)是否可以保存表中的更改SqlCommandBuilder？

 string query = "SELECT work_hours.work_hours_id, work_hours.date FROM work_hours
           LEFT OUTER JOIN project ON work_hours._project_id = project.project_id ORDER BY work_hours.date;
         SELECT * FROM project ORDER BY project_name";

            SqlCommand sqlcmd = new SqlCommand(query, conn);
            da = new SqlDataAdapter(query, connectionString);
            cBuilder = new SqlCommandBuilder(da);
            dt = new DataTable();
            ds = new DataSet();
            da.Fill(dt);
            da.Fill(ds);

            DataGridViewComboBoxColumn columnCb = new DataGridViewComboBoxColumn();
            columnCb.DataPropertyName = "_project_id";

            columnCb.DataSource = ds.Tables[1];
            columnCb.ValueMember = "project_id";
            columnCb.DisplayMember = "project_name";

            bSource = new BindingSource();
            bSource.DataSource = dt;
            dataGridView1.DataSource = bSource;
            dataGridView1.Columns.Add(columnCb);

这是示例：

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1 回答 1

2

如果我没有误解你想设置 datagridview 的组合框列的数据源..你可以这样设置：

/// if you use OfType Method then you will get advantage of to use as normal control
/// means this method will give you advantage of can use all method and properties
/// of the control which you want to implement in DataGridView

/// Controls.OfType method will check all the columns and get an array with 
/// what you give as search criteria..here, the criteria is ComboboxColumn..
/// depends of your need you can give comboboxcell also..

/// Element at method selects the zero based index in array which filtered by criteria
/// if you use only one of the given type then you can use .First() instead of .ElementAt()


yourDataGridViewName.Controls.OfType<DataGridViewComboBoxColumn>()
.ElementAt(indexNoOfTheDGVComboBox).DataSource = YourDataRetrievingMethod; 
//i.e. ds.Tables[indexNoOfTheTable].Columns[IndexOfTheColumn]

/// and you can set DisplayMember and ValueMember as the same way.. 
/// i give combocell and combocolumn together to show the syntax.

yourDataGridViewName.Controls.OfType<DataGridViewComboBoxCell>()
.ElementAt(0).DisplayMember = "YourDisplay";

yourDataGridViewName.Controls.OfType<DataGridViewComboBoxCell>()
.ElementAt(0).ValueMember = "YourValue";

关于第二个问题..如果您问我，那么我更喜欢：要控制“意外节省”，请在行尾放置一个 buttonCell..当用户更改行上的某些内容时，应单击保存按钮..然后在您的按钮中单击方法您可以将更改保存为正常的插入或更新方法..

那里只有2个区别..

1-）您需要使用Cell_Click事件并确保使用OfType()方法而不是正常Button _Click事件进行按钮检查

2-) 取决于项目需要，您需要获取 DataGridViewRowIndex和/或Cell Address()之前获取值并将值传递给 SQLQuery

于 2012-06-06T21:24:35.960 回答