grid应用
提交当前行的修改
using DevExpress.XtraGrid;
using DevExpress.XtraGrid.Views.Base;
using System.Data.Common;
//...
public void UpdateDatasource(GridControl grid) {
//Save the latest changes to the bound DataTable
ColumnView view = (ColumnView)grid.FocusedView;
view.CloseEditor();
if(!view.UpdateCurrentRow()) return;
//Update the database's Suppliers table to which oleDBDataAdapter1 is connected
DoUpdate(oleDbDataAdapter1, dataSet11.Tables["Suppliers"]);
//Update the database's Products table to which the oleDbDataAdapter2 is connected
DoUpdate(oleDbDataAdapter2, dataSet11.Tables["Products"]);
}
public void DoUpdate(DbDataAdapter dataAdapter, System.Data.DataTable dataTable) {
try {
dataAdapter.Update(dataTable);
} catch(Exception ex) {
MessageBox.Show(ex.Message);
}
}
从非绑定数据源得到数据
private void Form1_Load(object sender, System.EventArgs e) {
// ...
// Create an unbound column.
GridColumn unbColumn = gridView1.Columns.Add("Total");
unbColumn.VisibleIndex = gridView1.Columns.Count;
unbColumn.UnboundType = DevExpress.Data.UnboundColumnType.Decimal;
// Disable editing.
unbColumn.OptionsColumn.AllowEdit = false;
// Specify format settings.
unbColumn.DisplayFormat.FormatType = DevExpress.Utils.FormatType.Numeric;
unbColumn.DisplayFormat.FormatString = "c";
// Customize the appearance settings.
unbColumn.AppearanceCell.BackColor = Color.LemonChiffon;
}
// Returns the total amount for a specific row.
decimal getTotalValue(ColumnView view, int rowHandle) {
decimal unitPrice = Convert.ToDecimal(view.GetRowCellValue(rowHandle, "UnitPrice"));
decimal quantity = Convert.ToDecimal(view.GetRowCellValue(rowHandle, "Quantity"));
decimal discount = Convert.ToDecimal(view.GetRowCellValue(rowHandle, "Discount"));
return unitPrice * quantity * (1 - discount);
}
// Provides data for the Total column.
private void gridView1_CustomUnboundColumnData(object sender, DevExpress.XtraGrid.Views.Base.CustomColumnDataEventArgs e) {
if(e.Column.FieldName == "Total" && e.IsGetData) e.Value = getTotalValue(sender as ColumnView, e.RowHandle);
}
运行时绑定到实现Ilist接口的数据源
public class Record {
int id, age;
string name;
public Record(int id, string name, int age) {
this.id = id;
this.name = name;
this.age = age;
}
public int ID { get { return id; } }
public string Name {
get { return name; }
set { name = value; }
}
public int Age {
get { return age; }
set { age = value; }
}
}
ArrayList listDataSource = new ArrayList();
listDataSource.Add(new Record(1, "Jane", 19));
listDataSource.Add(new Record(2, "Joe", 30));
listDataSource.Add(new Record(3, "Bill", 15));
listDataSource.Add(new Record(4, "Michael", 42));
gridControl1.DataSource = listDataSource;
gridControl1.MainView.PopulateColumns();
自定义列:
[C#]
DevExpress.XtraGrid.Views.Base.ColumnView view = gridControl1.MainView as DevExpress.XtraGrid.Views.Base.ColumnView;
DialogResult answer = MessageBox.Show("Do you want to create columns for all fields?", "Confirmation", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
if (answer == DialogResult.Yes)
view.PopulateColumns();
else {
string[] fieldNames = new string[] {"ProductID", "ProductName", "QuantityPerUnit", "UnitPrice"};
DevExpress.XtraGrid.Columns.GridColumn column;
view.Columns.Clear();
for (int i = 0; i < fieldNames.Length; i++) {
column = view.Columns.Add(fieldNames[i]);
column.VisibleIndex = i;
}
}
GridColumn主要属性
Property
Description
GridColumn.Name
设计时定义的列名
GridColumn.FieldName
绑定到的数据源中的列名
GridColumn.AbsoluteIndex
在grid中的绝对位置索引
GridColumn.ColumnHandle
指定关联数据源列名的标识，它不一定是唯一的，因为一个数据源列可以关联到一个Grid中的多个列.
手动创建Band
// obtaining the main view and clearing its bands collection
BandedGridView view = gridControl1.MainView as BandedGridView;
view.Bands.Clear();
// creating the bands layout
GridBand bandGeneral = view.Bands.Add("General Info");
GridBand bandTechnical = view.Bands.Add("Technical Info");
GridBand bandEngine = bandTechnical.Children.Add("Engine Info");
GridBand bandTransmission = bandTechnical.Children.Add("Transmission Info");
// assigning columns to bands
colTrademark.OwnerBand = bandGeneral;
colModel.OwnerBand = bandGeneral;
colLiter.OwnerBand = bandEngine;
colCylinders.OwnerBand = bandEngine;
colSpeedCount.OwnerBand = bandTransmission;
colTransmission.OwnerBand = bandTransmission;
如何定位和查找指定列显示值的行(注意是列的实显示值，而不是关联数据源列值)
using DevExpress.XtraGrid.Views.Base;
using DevExpress.XtraGrid.Columns;
// ...
string searchText = "Japan";
// obtaining the focused view
ColumnView view = (ColumnView)gridControl1.FocusedView;
// obtaining the column bound to the Country field
GridColumn column = view.Columns["Country"];
if(column != null) {
// locating the row
//如果用数据源中的列值，请用ColumnView.LocateByValue
int rhFound = view.LocateByDisplayText(view.FocusedRowHandle + 1, column, searchText);
// focusing the cell
if(rhFound != GridControl.InvalidRowHandle) {
view.FocusedRowHandle = rhFound;
view.FocusedColumn = column;
}
}
另一个查找示例
DevExpress.XtraGrid.Views.Base.ColumnView view = gridControl1.MainView as DevExpress.XtraGrid.Views.Base.ColumnView;
view.BeginUpdate();
try {
int rowHandle = 0;
DevExpress.XtraGrid.Columns.GridColumn col = view.Columns["Category"];
while(true) {
// locating the next row
rowHandle = view.LocateByValue(rowHandle, col, "SPORTS");
// exiting the loop if no row is found
if (rowHandle == DevExpress.XtraGrid.GridControl.InvalidRowHandle)
break;
// perform specific operations on the row found here
// ...
rowHandle++;
}
} finally { view.EndUpdate(); }
将特定编辑框绑定到列
默认的cell编辑框是不可以改变的，即使是在运行时，因为它们是动态创建和注销的。
要想定制，就在设计时修改ColumnEdit吧。
using DevExpress.XtraEditors.Repository;
//Create a repository item for a combo box editor
RepositoryItemComboBox riCombo = new RepositoryItemComboBox();
riCombo.Items.AddRange(new string[] {"London", "Berlin", "Paris"});
//Add the item to the internal repository
gridControl1.RepositoryItems.Add(riCombo);
//Now you can define the repository item as an in-place column editor
colCity.ColumnEdit = riCombo;
另一个运行时绑定列编辑框示例
private void gridView1_CustomRowCellEdit(object sender, DevExpress.XtraGrid.Views.Grid.CustomRowCellEditEventArgs e) {
if (e.Column.FieldName == "FieldName") return;
DevExpress.XtraGrid.Views.Grid.GridView gv = sender as DevExpress.XtraGrid.Views.Grid.GridView;
string fieldName = gv.GetRowCellValue(e.RowHandle, gv.Columns["FieldName"]).ToString();
switch (fieldName) {
case "Population":
e.RepositoryItem = repositoryItemSpinEdit1;
break;
case "Country":
e.RepositoryItem = repositoryItemComboBox1;
break;
case "Capital":
e.RepositoryItem = repositoryItemCheckEdit1;
break;
}
}
检验录入数据是否有效
using DevExpress.XtraGrid.Views.Grid;
using DevExpress.XtraGrid.Columns;
public bool isValidDate(int day, int month, int year) {
return (day > 0) && (month > 0) && (month <= 12) && (year > 1980) && (year < 2100) && (day <= DateTime.DaysInMonth(year, month));
}
private void gridView1_ValidateRow(object sender, DevExpress.XtraGrid.Views.Base.ValidateRowEventArgs e) {
GridView view = sender as GridView;
GridColumn colDay = view.Columns["Day"];
GridColumn colMonth = view.Columns["Month"];
GridColumn colYear = view.Columns["Year"];
int day = (int)view.GetRowCellValue(e.RowHandle, colDay);
int month = (int)view.GetRowCellValue(e.RowHandle, colMonth);
int year = (int)view.GetRowCellValue(e.RowHandle, colYear);
e.Valid = isValidDate(day, month, year);
if(!e.Valid) {
view.SetColumnError(colDay, "Check the day");
view.SetColumnError(colMonth, "Check the month");
view.SetColumnError(colYear, "Check the year");
}
}
MouseMove捕捉
private void Grid_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
{
ShowHitInfo(this.gridView1.CalcHitInfo(new Point(e.X, e.Y)));
}
private void ShowHitInfo(DevExpress.XtraGrid.Views.Grid.ViewInfo.GridHitInfo hi)
{
DevExpress.XtraGrid.Views.Base.ColumnView cgv =
(DevExpress.XtraGrid.Views.Base.ColumnView)Grid.MainView;
string columnName = hi.Column == null ? "No column" : hi.Column.Caption;
switch(columnName)
{
case "账号":
txtUserName.Text = cgv.GetRowCellDisplayText(hi.RowHandle,hi.Column);
break;
case "密码":
txtPassword.Text = cgv.GetRowCellDisplayText(hi.RowHandle,hi.Column);
break;
case "真实姓名":
txtRealName.Text = cgv.GetRowCellDisplayText(hi.RowHandle,hi.Column);
break;
case "电子邮件":
txtEmail.Text = cgv.GetRowCellDisplayText(hi.RowHandle,hi.Column);
break;
case "角色":
cbRole.Text = cgv.GetRowCellDisplayText(hi.RowHandle,hi.Column);
break;
default:
txtUserName.Text = "Null";
txtPassword.Text = "Null";
txtRealName.Text = "Null";
txtEmail.Text = "Null";
cbRole.Text = "Null";
break;
}
