c# - 如何从数据集中设置 DataGridViewComboBoxColumn 值

Question

假设我有两个表:

 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 中我想看到这个:

 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. 如果我将 pr1 (work_hours_id = 3) 更改为 pr3 (DataGridViewComboBoxColumn) 与 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);

Answer 1

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..如果你问我那么我更喜欢:为了控制“意外节省”在行的末尾放置一个buttonCell..当用户更改行上的内容时应该点击保存按钮..然后在您的按钮单击方法可以将更改保存为正常的插入或更新方法..

那里只有 2 个不同之处..

1-) 您需要使用 Cell_Click 事件，并确保使用 OfType() 方法而不是普通的 Button _Click 来检查按钮> 事件

2-) 根据项目需要，您需要先获取 DataGridView 的 RowIndex 和/或 Cell Address() 才能获取值并将值传递给 SQLQuery