如何更改扩展ButtonField字段的值？

Question

我想这取决于其他因素来改变在ButtonField字段的文本的值。一些代码：

    public override void InitializeCell(DataControlFieldCell cell, DataControlCellType cellType, DataControlRowState rowState, int rowIndex)
    {
        base.InitializeCell(cell, cellType, rowState, rowIndex);

        bool isDataRowAndIsHighlightFieldSpecified = cellType == DataControlCellType.DataCell && !string.IsNullOrEmpty(UnnpiFlagField);
        if (isDataRowAndIsHighlightFieldSpecified)
        {
            cell.DataBinding += new EventHandler(cell_DataBinding);
        }
    }

    private void cell_DataBinding(object sender, EventArgs e)
    {
        TableCell cell = (TableCell)sender;
        object dataItem = DataBinder.GetDataItem(cell.NamingContainer);

        IButtonControl button = cell.Controls[0] as IButtonControl;
        button.Text = DataBinder.GetPropertyValue(dataItem, DataTextField).ToString();
        bool highlightTheText = DataBinder.GetPropertyValue(dataItem, IsFlagField).ToString().ToUpper() == "Y";
        if (highlightTheText)
        {
            cell.CssClass = string.Concat(ItemStyle.CssClass, " thisChangesFine");
            button.Text = "CHANGE ME";
        }
    }

此代码绑定列的伟大工程，该小区的文字被改变，并强调，但即使按钮控制确实有正确的CommandName通过aspx页面设置按钮，文本价值进行初始包含什么，似乎是设置在其他地方。当我在这里将它设置为另一个值似乎被重置为初始值别的地方。展望反射我看不出这可能发生。反射所示：

protected override DataControlField CreateField()
public override bool Initialize(bool sortingEnabled, Control control)
private void OnDataBindField(object sender, EventArgs e) [Can't get that one :(]
protected override void CopyProperties(DataControlField newField)
protected virtual string FormatDataTextValue(object dataTextValue)
public override void ValidateSupportsCallback()

我已经检查了每一个和我没有看到价值越来越设置。这似乎是在OnDataBindField（对象，EventArgs的）这里发生：

if ((this.textFieldDesc == null) && (component != null))
    {
        ...
        this.textFieldDesc = TypeDescriptor.GetProperties(component).Find(dataTextField, true);
        ...
    } 
    if ((this.textFieldDesc != null) && (component != null))
    {
        object dataTextValue = this.textFieldDesc.GetValue(component);
        str = this.FormatDataTextValue(dataTextValue);
    }
  ...
  ((IButtonControl) control).Text = str;

这点我会觉得会发生的事情之前，我试图改变的价值，但正如我已经说过了，似乎之前button.Text是的String.Empty在cell_DataBinding方法。

任何人有什么想法？

Answer 1

我通过在数据绑定事件并创建字符串的列表以发射时的PreRender叫做：

            public override void InitializeCell(DataControlFieldCell cell, DataControlCellType cellType, DataControlRowState rowState, int rowIndex)
    {
        base.InitializeCell(cell, cellType, rowState, rowIndex);

        bool isDataRowAndIsHighlightFieldSpecified = cellType == DataControlCellType.DataCell && !string.IsNullOrEmpty(SpecialField);
        if (isDataRowAndIsHighlightFieldSpecified)
        {
            cell.DataBinding += new EventHandler(cell_DataBinding);
            cell.PreRender += new EventHandler(cell_PreRender);
        }
    }

和

    IList<string> buttonsText = new List<string>();
    private void cell_DataBinding(object sender, EventArgs e)
    {
        TableCell cell = (TableCell)sender;
        object dataItem = DataBinder.GetDataItem(cell.NamingContainer);
        bool specialData = DataBinder.GetPropertyValue(dataItem, SpecialField);
        if (specialData)
        {
            cell.CssClass = string.Concat(ItemStyle.CssClass, " special");
            buttonsText.Add("Replace text");
        }
        else
        {
            buttonsText.Add(DataBinder.GetPropertyValue(dataItem, DataTextField).ToString());
        }
    }

和最后在预渲染：

    void cell_PreRender(object sender, EventArgs e)
    {
        TableCell cell = (TableCell)sender;
        IButtonControl button = cell.Controls[0] as IButtonControl;
        int index = ((GridViewRow)cell.NamingContainer).RowIndex;
        button.Text = buttonsText[index];
    }

这种方法的唯一的缺陷是你必须调用数据绑定。我虽然所以这是不是我的问题和工作桃色。