protected override int CreateChildControls(System.Collections.IEnumerable dataSource, bool dataBinding)
{
int numRows = base.CreateChildControls(dataSource, dataBinding);
//no data rows created, create empty table if enabled
if (numRows == 0 && ShowWhenEmpty)
{
//create table
Table table = new Table();
table.ID = this.ID;
//convert the exisiting columns into an array and initialize
DataControlField[] fields = new DataControlField[this.Columns.Count];
this.Columns.CopyTo(fields, 0);
if (this.ShowHeader)
{
//create a new header row
GridViewRow headerRow = base.CreateRow(-1, -1, DataControlRowType.Header, DataControlRowState.Normal);
this.InitializeRow(headerRow, fields);
table.Rows.Add(headerRow);
}
//create the empty row
GridViewRow emptyRow = new GridViewRow(-1, -1, DataControlRowType.EmptyDataRow, DataControlRowState.Normal);
TableCell cell = new TableCell();
cell.ColumnSpan = this.Columns.Count;
cell.Width = Unit.Percentage(100);
if (!String.IsNullOrEmpty(EmptyDataText))
{
cell.Controls.Add(new LiteralControl(EmptyDataText));
}
if (this.EmptyDataTemplate != null)
{
EmptyDataTemplate.InstantiateIn(cell);
}
emptyRow.Cells.Add(cell);
table.Rows.Add(emptyRow);
if (this.ShowFooter)
{
//create footer row
GridViewRow footerRow = base.CreateRow(-1, -1, DataControlRowType.Footer, DataControlRowState.Normal);
this.InitializeRow(footerRow, fields);
table.Rows.Add(footerRow);
}
this.Controls.Clear();
this.Controls.Add(table);
}
return(numRows);
}
/// <summary>
/// GridView数据为空时呈现的样式
/// </summary>
/// <param name="writer"> </param>
protected virtual void RenderEmptyContent(HtmlTextWriter writer)
{
Table t = new Table(); //创建一个HTML的Table
t.GridLines = GridLines; //设置Table的线型与GridView相同
t.BorderStyle = BorderStyle; //设置边界风格与GridView相同
t.BorderWidth = 0; //??
t.CellPadding = 1;
t.CellSpacing = 1;
t.HorizontalAlign = HorizontalAlign; //设置水平对齐风格与GridView相同
t.Width = Width; //设置Table宽度与GridView相同
t.CopyBaseAttributes(this);
t.BorderColor = BorderColor; //设置边界颜色与GridView相同
t.EnableTheming = EnableTheming; //设置主题是否生效与GridView相同
t.ForeColor = ForeColor; //设置前景色与GridView相同
t.SkinID = SkinID; //设置皮肤样式与GridView相同
t.ToolTip = ToolTip; //设置提示信息与GridView相同
t.Visible = Visible; //设置是否可见与GridView相同
t.Font.CopyFrom(Font); //设置字体对象与GridView相同
//设置Table的层叠样式表
t.CssClass = EmptyDataTableCssClass != "" ? EmptyDataTableCssClass : CssClass;
TableRow row = new TableRow(); //新建一个行
row.CssClass = EmptyDataTitleRowCssClass; //设置行的与层叠样式表
row.Height = 25;
//将行添加到Table中
t.Rows.Add(row);
//根据GridView中的字段创建Table行的单元格
foreach (DataControlField field in Columns)
{
if (field.Visible) //如果GridView中的该字段可见
{
TableCell cell = new TableCell(); //创建单元格
cell.Text = field.HeaderText; //设置单元格文本
row.Cells.Add(cell); //将单元格添加到行中
}
}
TableRow row2 = new TableRow(); //新建第二行
row2.CssClass = EmptyDataContentRowCssClass; //设置行的与层叠样式表
t.Rows.Add(row2);
TableCell msgCell = new TableCell();
if (EmptyDataTemplate != null) //如果GridView中设置了空模板
{
EmptyDataTemplate.InstantiateIn(msgCell);
}
else
{
msgCell.Text = EmptyDataText; //设置单元格文本为空数据提示
}
msgCell.HorizontalAlign = HorizontalAlign.Center; //设置单元格的水平对齐
msgCell.ColumnSpan = Columns.Count; //设置单元格的列合并
row2.Cells.Add(msgCell);
t.RenderControl(writer); //将Table发送给HTML呈现流
}
protected override void PerformDataBinding(System.Collections.IEnumerable data)
{
base.PerformDataBinding(data);
if (data == null && this.DataItem != null)
{
data = new object[] {
this.DataItem
}
}
;
else if (data == null)
{
return;
}
foreach (var i in data)
{
_dataItemContainer.DataItem = i;
if (i == null && EmptyDataTemplate != null)
{
EmptyDataTemplate.InstantiateIn(_dataItemContainer);
}
else
{
ItemTemplate.InstantiateIn(_dataItemContainer);
}
_dataItemContainer.DataBind();
if (i != null)
{
OrderedDictionary keyTable = this.KeyTable;
if (keyTable != null)
{
keyTable.Clear();
string[] dataKeyNamesInternal = this.DataKeyNamesInternal;
if (dataKeyNamesInternal != null && dataKeyNamesInternal.Length != 0)
{
foreach (string str in dataKeyNamesInternal)
{
object propertyValue = DataBinder.GetPropertyValue(i, str);
keyTable.Add(str, propertyValue);
}
_dataKey = new DataKey(keyTable);
}
}
}
}
this.ExtractRowValues(this.BoundFieldValues, false);
}
protected override void CreateChildControls()
{
if (Items == null || Items.Count() == 0)
{
if (EmptyDataTemplate != null)
{
EmptyDataTemplate.InstantiateIn(this);
}
}
else if (GenerateMethod != null)
{
int i = 0;
foreach (object n in Items)
{
Controls.Add(GenerateMethod(i++, n));
}
}
ChildControlsCreated = true;
}
protected override void OnPreRender(EventArgs e)
{
base.OnPreRender(e);
// Dummy control to which we parent all the data item controls
Control containerControl = new Control();
IEnumerable dataItems = ViewData.Eval(Name) as IEnumerable;
bool hasData = false;
if (dataItems != null)
{
int index = 0;
foreach (object dataItem in dataItems)
{
hasData = true;
RepeaterItem repeaterItem = new RepeaterItem(index, dataItem)
{
ViewData = new ViewDataDictionary(dataItem),
};
ItemTemplate.InstantiateIn(repeaterItem);
containerControl.Controls.Add(repeaterItem);
index++;
}
}
if (!hasData)
{
// If there was no data, instantiate the EmptyDataTemplate
Control emptyDataContainer = new Control();
EmptyDataTemplate.InstantiateIn(emptyDataContainer);
containerControl.Controls.Add(emptyDataContainer);
}
Controls.Add(containerControl);
containerControl.DataBind();
}
protected override void CreateChildControls()
{
if (Items == null || Items.Count() == 0)
{
if (EmptyDataTemplate != null)
{
EmptyDataTemplate.InstantiateIn(this);
}
}
else
{
Controls.Clear();
foreach (var i in Items)
{
var r = new TableRow();
foreach (var c in Columns)
{
r.Controls.Add(c.RenderColumn(i));
}
Controls.Add(r);
}
}
ChildControlsCreated = true;
}
protected override int CreateChildControls(IEnumerable dataSource, bool dataBinding)
{
int rows = base.CreateChildControls(dataSource, dataBinding);
// no data rows created, create empty table if enabled
if (rows == 0 && (ShowFooterWhenEmpty || ShowHeaderWhenEmpty))
{
// create the table
Table table = CreateChildTable();
Controls.Clear();
Controls.Add(table);
DataControlField[] fields;
if (AutoGenerateColumns)
{
var source = new PagedDataSource {
DataSource = dataSource
};
ICollection autoGeneratedColumns = CreateColumns(source, true);
fields = new DataControlField[autoGeneratedColumns.Count];
autoGeneratedColumns.CopyTo(fields, 0);
}
else
{
fields = new DataControlField[Columns.Count];
Columns.CopyTo(fields, 0);
}
TableRowCollection newRows = table.Rows;
if (ShowHeaderWhenEmpty)
{
// create a new header row
_headerRow = CreateRow(-1, -1, DataControlRowType.Header, DataControlRowState.Normal);
InitializeRow(_headerRow, fields, newRows);
}
// create the empty row
GridViewRow emptyRow = new GridViewRow(-1, -1, DataControlRowType.EmptyDataRow, DataControlRowState.Normal);
TableCell cell = new TableCell();
List <DataControlField> f = fields.Where(dataControlField => dataControlField.Visible).ToList();
cell.ColumnSpan = f.Count;
//cell.Width = Unit.Percentage(100);
// respect the precedence order if both EmptyDataTemplate
// and EmptyDataText are both supplied ...
if (EmptyDataTemplate != null)
{
EmptyDataTemplate.InstantiateIn(cell);
}
else if (!string.IsNullOrEmpty(EmptyDataText))
{
cell.Controls.Add(new LiteralControl(EmptyDataText));
}
emptyRow.Cells.Add(cell);
GridViewRowEventArgs e = new GridViewRowEventArgs(emptyRow);
OnRowCreated(e);
newRows.Add(emptyRow);
emptyRow.DataBind();
OnRowDataBound(e);
emptyRow.DataItem = null;
if (ShowFooterWhenEmpty && ShowFooter)
{
// create footer row
_footerRow = CreateRow(-1, -1, DataControlRowType.Footer, DataControlRowState.Normal);
InitializeRow(_footerRow, fields, newRows);
newRows.Remove(emptyRow);
}
}
return(rows);
}
){kind=link}