自定义webpart参数---动态下拉列表

最新推荐文章于 2013-12-23 17:15:42 发布

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本文介绍了如何使用VS2010为SharePoint2010开发自定义WebPart，包括不带参数、带参数的WebPart及其不同应用场景。详细解释了带参数WebPart的实现步骤，并提供了绑定外部数据的具体代码示例。

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本篇文章介绍的是在sharepoint 2010中用VS 2010开发自定义webpart。

自定义开发的webpart分为两种：带参数的和不带参数的；带参数的分为需要绑定外部数据的和不需要绑定外部数据的。

不带参数的webpart：

这种webpart开发最简单，只需要将webpart页面的后台逻辑处理完就可以，不需要外来的参数。

不需要绑定外部数据的带参数的webpart：

这种webpart开发，需要在继承system.web.ui.webcontrols.webparts.webpart的类中增加参数，即如下形式的代码：

                     [Personalizable(),
                    WebDisplayNameAttribute("FullUrl"),
                     WebBrowsable]
                     public string FullUrl
                     {
                         get;
                        set;
                    }

也可增加emun类型的下拉列表参数（但是其中的参数是在代码中写死的）。

需要绑定外部数据的带参数的webpart：

这种webpart的开发相对比较麻烦，除了需要在继承system.web.ui.webcontrols.webparts.webpart的类中增加参数之外，还需要在继承system.web.ui.webcontrols.webparts.Editorpart的类中绑定外来数据并传给继承system.web.ui.webcontrols.webparts.webpart的类中的参数。

在继承system.web.ui.webcontrols.webparts.Editorpart的类中，需要重载方法：

1. protected override void CreateChildControls()：该方法是用来构建编辑webpart时选择参数的页面；

2.public override void SyncChanges()：该方法是用来绑定外部数据到webpart编辑页面的控件中的；

3.public override bool ApplyChanges()：该方法是用来将编辑页面中控件的值回传给继承system.web.ui.webcontrols.webparts.webpart的类中的参数。

例子如下：

    [ToolboxItemAttribute(false)]
    public class Statistics_Monthly : WebPart
    {

        [Personalizable(),
        WebDisplayNameAttribute("工作量统计类别")]
        public string BisicCategory
        {
            get;
            set;
        }

        [Personalizable(),
        WebDisplayNameAttribute("工作量统计时间")]
        public string StatisticsTime
        {
            get;
            set;
        }

// 当更改可视 Web 部件项目项时，Visual Studio 可能会自动更新此路径。
private const string _ascxPath = @"~/_CONTROLTEMPLATES/StatisticsWebPart_Monthly/Statistics_Monthly/Statistics_MonthlyUserControl.ascx";

        protected override void CreateChildControls()
        {
            Control control = Page.LoadControl(_ascxPath);

            if (control != null)
            {
                ((Statistics_MonthlyUserControl)control).webPart = this;
            }

Controls.Add(control);
}

        public override EditorPartCollection CreateEditorParts()
        {
            EditorPartCollection baseParts = base.CreateEditorParts();
            List<EditorPart> editorParts = new List<EditorPart>(1);
            EditorPart part = new Statistics_Monthly_Edit();
            part.ID = this.ID + "_Statistics_Monthly_Editor";
            part.Title = "Statistics_Monthly变量选择";
            editorParts.Add(part);
            return new EditorPartCollection(baseParts, editorParts);
        }

}

public class Statistics_Monthly_Edit : EditorPart
{

        protected Label label_BasicCategory;
        protected DropDownList ddl_BasicCategory;
        protected Label label_Time;
        protected DropDownList ddl_Year;
        protected Label label_Year;
        protected DropDownList ddl_Month;
        protected Label label_Month;

        protected override void CreateChildControls()
        {
            base.CreateChildControls();

            this.label_BasicCategory = new Label();
            this.label_BasicCategory.Text = "工作量统计类型：";
            this.ddl_BasicCategory = new DropDownList();
            this.ddl_BasicCategory.AutoPostBack = true;
            this.ddl_BasicCategory.SelectedIndexChanged += new EventHandler(ddl_BasicCategory_SelectedIndexChanged);

            this.label_Time = new Label();
            this.label_Time.Text = "请选择显示时间：";
            this.ddl_Year = new DropDownList();
            this.ddl_Year.AutoPostBack = true;
            this.ddl_Year.SelectedIndexChanged += new EventHandler(ddl_Year_SelectedIndexChanged);
            this.label_Year = new Label();
            this.label_Year.Text = "年";
            this.ddl_Month = new DropDownList();
            this.ddl_Month.AutoPostBack = true;
            this.ddl_Month.SelectedIndexChanged += new EventHandler(ddl_Month_SelectedIndexChanged);
            this.label_Month = new Label();
            this.label_Month.Text = "月";

Table tb = new Table();

            TableRow row = new TableRow();
            TableCell cell1 = new TableCell();
            TableCell cell2 = new TableCell();
            cell1.Controls.Add(this.label_BasicCategory);
            cell2.Controls.Add(this.ddl_BasicCategory);
            row.Cells.Add(cell1);
            row.Cells.Add(cell2);
            tb.Rows.Add(row);

            row = new TableRow();
            cell1 = new TableCell();
            cell2 = new TableCell();
            cell1.Controls.Add(this.label_Time);
            cell2.Controls.Add(this.ddl_Year);
            cell2.Controls.Add(this.label_Year);
            cell2.Controls.Add(this.ddl_Month);
            cell2.Controls.Add(this.label_Month);
            row.Cells.Add(cell1);
            row.Cells.Add(cell2);
            tb.Rows.Add(row);

this.Controls.Add(tb);
}

        protected void ddl_BasicCategory_SelectedIndexChanged(object sender, EventArgs e)
        {

        }

        protected void ddl_Year_SelectedIndexChanged(object sender, EventArgs e)
        {

        }

        protected void ddl_Month_SelectedIndexChanged(object sender, EventArgs e)
        {

        }

        public override bool ApplyChanges()
        {
            this.EnsureChildControls();
            Statistics_Monthly webpart = this.WebPartToEdit as Statistics_Monthly;
            if (webpart == null)
            {
                return false;
            }
            else
            {
                if (this.ddl_BasicCategory.SelectedItem != null)
                {
                    webpart.BisicCategory = this.ddl_BasicCategory.SelectedValue;
                }
                else
                {
                    webpart.BisicCategory = string.Empty;
                }

                if ((this.ddl_Year.SelectedItem != null) && (this.ddl_Month.SelectedItem != null))
                {
                    webpart.StatisticsTime = this.ddl_Year.SelectedValue + "/" + this.ddl_Month.SelectedValue;
                }
                else
                {
                    webpart.StatisticsTime = string.Empty;
                }
                return true;
            }
        }

        public override void SyncChanges()
        {
           EnsureChildControls();
           Statistics_Monthly webpart = this.WebPartToEdit as Statistics_Monthly;
           if (webpart != null)
           {
               InitBasicCategory(webpart);
               InitStatisticsTime(webpart);
           }
        }

        private void InitBasicCategory(Statistics_Monthly webpart)
        {

从外部获取值并绑定到this.ddl_BasicCategory下拉列表中。
}

private void InitStatisticsTime(Statistics_Monthly webpart)
{

从外部获取值并绑定到this.ddl_Year和this.ddl_Month的dropdownlist中的值。
}

}