在SharePoint Web部件中为动态控件持久化用户输入

使用解决方案在底部编辑

我将这些作为Web部件的类变量:

Panel constraintPanel;
HtmlInputText[] constraints;
Label[] constraintLabels = null;

在覆盖CreateChildControls中,我初始化面板:

constraintPanel = new Panel();

我在重写的OnPreRender中构建了动态输入框(注意:我听说有人说可以在OnInit、OnLoad或OnPreRender中实现,但OnPreRender是唯一一个不会导致整个Web部件出错的输入框):

protected override void OnPreRender(EventArgs e)
{
    buildConstraints();
    base.OnPreRender(e);
}

private void buildConstraints()
{
    if (!viewSelect.SelectedValue.Equals(INConstants.NoFilterOption))
    {
        string[,] constraintList = docManager.GetFilterConstraints(viewFilterSelect.SelectedValue);
        if (constraintList != null)
        {
            this.constraints = new HtmlInputText[constraintList.Length / 2];
            this.constraintLabels = new Label[constraintList.Length / 2];
            for (int constraintCount = 0; constraintCount < constraintList.Length / 2; constraintCount++)
            {
                Label constraintLabel = new Label();
                constraintPanel.Controls.Add(constraintLabel);
                constraintLabel.Text = constraintList[constraintCount, 0];
                this.constraintLabels[constraintCount] = constraintLabel;

                HtmlInputText constraint = new HtmlInputText();
                constraintPanel.Controls.Add(constraint);
                constraint.ID = "constraint_" + constraintCount;
                constraint.MaxLength = 12;
                constraint.Style.Add("FONT-FAMILY", "Verdana");
                constraint.Style.Add("FONT-SIZE", "11");
                this.constraints[constraintCount] = constraint;
            }
        }
    }
}

...
constraintPanel.RenderBeginTag(output); // not sure if this is needed
if (constraints != null && constraints.Length > 0)
{
    foreach (Control tempControl in constraintPanel.Controls)
    {
        if (tempControl is Label)
        {
            output.WriteLine("<tr>");
            output.WriteLine("<td width='2%' nowrap><font class='search-header'>");
            tempControl.RenderControl(output);
            output.WriteLine("&nbsp;");
        }
        else if (tempControl is HtmlInputText)
        {
            tempControl.RenderControl(output);
            output.WriteLine("</td>");
            output.WriteLine("<td width='*' nowrap></td>");
            output.WriteLine("</tr>");
        }
    }
}
constraintPanel.RenderEndTag(output); // not sure if this is needed
...

使用解决方案编辑:

以下是OnLoad中的代码,仅供参考:

protected override void OnLoad(EventArgs e)
{
    base.OnLoad(e);
    try
    {
        viewsBuildConstraints();
    }
    catch (Exception)
    {
    }
}