Asp.net 在TreeView.DataBind（）之后设置SelectedNode

我正在页面中使用ASP.NET TreeView控件。 我使用CreateChildControls（）（覆盖）构建树

我通过填写表单创建一个新节点，然后调用此方法

protected void btnSubmit_Click(object sender, EventArgs e)
    {
        try
        {
            var entityIdHidden = this.FindControl<HiddenField>("SelectedNodeId");


            if (entityIdHidden != null)
                if (entityIdHidden.Value == "")
                    if (!CheckifSiteAlreadyExists())
                        return;


            if (!CheckIfEntityHasParent())
                return;


            var user = AuthenticationManager.LoggedInUser;
            WorkflowAPI api = new WorkflowAPI();


            Dictionary<string, object> entityFields = GetEntityControls();
            AttachmentEntity image = AttchmentItem("AsyncFileUpload2");


            if (image != null)
                entityFields.Add("fldImage", image);


            int entityId = 0;
            bool isSite = CheckIfEntityIsSite();
            if ((entityIdHidden != null) && (!string.IsNullOrEmpty(entityIdHidden.Value)))
            {
                int.TryParse(entityIdHidden.Value, out entityId);
            }
            api.UpdateACtivityFields(WorkflowInstanceId, user, this.GetFormUIViewModel().ActivityInstance, entityFields, entityId, "EntityType");


            List<DBParameter> prms = new List<DBParameter>();
            prms.Add(new DBParameter(System.Data.DbType.Int32, WorkflowInstanceId, "iwf"));
            prms.Add(new DBParameter(System.Data.DbType.Int32, entityId, "entityId"));
            int.TryParse(DBUtil.ExecuteScalar("USP_TEN_Entities_UpdateDynamicsValues", prms.ToArray(),
                CommandType.StoredProcedure).ToString(), out entityId);


            Dictionary<string, object> siteFields;
            if (isSite)
            {
                siteFields = GetSiteControls();
                siteFields.Add("fldParentid", entityId);
                api.UpdateACtivityFields(WorkflowInstanceId, user, this.GetFormUIViewModel().ActivityInstance, siteFields, entityId, "SiteDetails");
            }


            entityIdHidden.Value = entityId.ToString();
            this.CreateChildControls();


            //Response.Redirect(Request.RawUrl);
        }
        catch (Exception ex)
        {
            PNMsoft.Sequence.Diagnostics.DiagnosticUtility.EventLog.LogError(String.Format("TreeViewOrg.aspx:    btnSave_Click(), {0}", ex.Message));
        }
    }

protectedvoid btnSubmit\u单击（对象发送方，事件参数e）
{
尝试
{
var entityIdHidden=this.FindControl（“SelectedNodeId”）；
if（entityIdHidden！=null）
如果（entityIdHidden.Value==“”）
如果（！CheckifSiteAlreadyExists（））
返回；
如果（！CheckIfEntityHasParent（））
返回；
var user=AuthenticationManager.LoggedInUser；
WorkflowAPI=新的WorkflowAPI（）；
Dictionary entityFields=GetEntityControl（）；
AttachmentEntity image=AttchmentItem（“AsyncFileUpload2”）；
如果（图像！=null）
添加（“fldImage”，图像）；
int entityId=0；
bool isSite=CheckIfEntityIsSite（）；
如果（（entityIdHidden！=null）&（！string.IsNullOrEmpty（entityIdHidden.Value）））
{
int.TryParse（entityIdHidden.Value，out entityId）；
}
api.UpdateACtivityFields（WorkflowInstanceId，用户，this.GetFormUIViewModel（）.ActivityInstance，entityFields，entityId，“EntityType”）；
List prms=新列表（）；
添加（新的DBParameter（System.Data.DbType.Int32，WorkflowInstanceId，“iwf”）；
添加（新的DBParameter（System.Data.DbType.Int32，entityId，“entityId”）；
int.TryParse（DBUtil.ExecuteScalar（“USP\u十个实体\u更新的动态值”），prms.ToArray（），
CommandType.StoredProcedure）.ToString（），out entityId）；
词典站点字段；
if（isSite）
{
siteFields=GetSiteControls（）；
添加（“fldParentid”，entityId）；
api.UpdateACtivityFields（WorkflowInstanceId，用户，this.GetFormUIViewModel（）.ActivityInstance，siteFields，entityId，“SiteDetails”）；
}
entityIdHidden.Value=entityId.ToString（）；
this.CreateChildControls（）；
//重定向（Request.RawUrl）；
}
捕获（例外情况除外）
{
PNMsoft.Sequence.diagnosticsutility.EventLog.LogError（String.Format（“TreeViewOrg.aspx:btnSave_Click（），{0}”，ex.Message））；
}
}

此方法使用我输入的详细信息更新数据库

正如您在最后的btnSubmit方法中所看到的，我调用CreateChildControls（）方法，因为我需要用最新的数据更新树。 问题是我失去了焦点和SelectedNode

---

如何返回到最后选择的节点。

首先，请检查您的CreateChildControls（）函数是否处于IsPostBack（）条件下。如果是，请浏览此链接，它将指导您如何执行此操作。

如果您可以发布代码，这样我们可以方便地帮助您……首先，我编辑了问题，请检查CreateChildControls（）函数是否在IsPostBack（）条件内。如果是，则通过此链接-。请检查和评论…嗨，我已经使用了你提供的文章，它的作品。谢谢…如果这对你有帮助的话，我会在回答中输入我的评论，所以当其他人将来来到这个页面时，他们会得到适当的参考，当然你也可以给我一些投票。谢谢

    public DataTable CreateTable()
    {
        DataTable dataTable = new DataTable();
        try
        {
            // base.DbConnection.Open();
            dataTable.Columns.Add(idColumnName);
            dataTable.Columns.Add(ParentColumnName);
            dataTable.Columns.Add(valueColumnName);
            List<DBParameter> prms = new List<DBParameter>();
            dataTable = DBUtil.ExecuteReader("sp_GetTreeViewHierarchy", prms.ToArray(), System.Data.CommandType.StoredProcedure);


        }
        catch (Exception ex)
        {
            PNMsoft.Sequence.Diagnostics.DiagnosticUtility.EventLog.LogError(String.Format("TreeViewOrg.aspx:    CreateTable(), {0}", ex.Message));
        }
        return dataTable;
    }

public DataRow[] CreateDataRow(DataTable table)
    {
        // Use the Select method to sort the rows by ParentID
        DataRow[] SortedRows = null;
        try
        {
            SortedRows = table.Select("", levelColumnName + "," + valueColumnName + "," + ParentColumnName);
        }
        catch (Exception ex)
        {
            PNMsoft.Sequence.Diagnostics.DiagnosticUtility.EventLog.LogError(String.Format("TreeViewOrg.aspx:    CreateDataRow(), {0}", ex.Message));
        }


        return SortedRows;
    }


    public XmlDocument CreateXML(DataRow[] SortedRows)
    {
        // create an XmlDocument (with an XML declaration)
        XmlDocument XDoc = new XmlDocument();
        try
        {
            XmlDeclaration XDec = XDoc.CreateXmlDeclaration("1.0", null, null);
            XDoc.AppendChild(XDec);


            // iterate through the sorted data
            // and build the XML document
            foreach (DataRow Row in SortedRows)
            {
                XmlElement NewNode = XDoc.CreateElement("_" + Row[idColumnName].ToString());
                NewNode.SetAttribute(idColumnName, Row[idColumnName].ToString());
                NewNode.SetAttribute(ParentColumnName, Row[ParentColumnName].ToString());
                NewNode.SetAttribute(valueColumnName, Row[valueColumnName].ToString());


                // special case for top level node
                if (int.Parse(Row[ParentColumnName].ToString()) == 0)
                    XDoc.AppendChild(NewNode);  // root node
                else
                {
                    // use XPath to find the parent node in the tree
                    String SearchString;
                    SearchString = String.Format("//*[@" + idColumnName + "=\"{0}\"] ", Row[ParentColumnName].ToString());
                    XmlNode Parent = XDoc.SelectSingleNode(SearchString);


                    if (Parent != null)
                        Parent.AppendChild(NewNode);
                }
            }
        }
        catch (Exception ex)
        {
            PNMsoft.Sequence.Diagnostics.DiagnosticUtility.EventLog.LogError(String.Format("TreeViewOrg.aspx:    CreateXML(), {0}", ex.Message));
        }
        return XDoc;
    }


    public void FillTreeViewFromXML(XmlDocument XDoc)
    {
        try
        {
            // we cannot bind the TreeView directly to an XmlDocument
            // so we must create an XmlDataSource and assign the XML text
            XmlDataSource XDdataSource = new XmlDataSource();
            XDdataSource.ID = DateTime.Now.Ticks.ToString();  // unique ID is required
            XDdataSource.Data = XDoc.OuterXml;


            // we want the full name displayed in the tree so 
            // do custom databindings
            TreeNodeBinding Binding = new TreeNodeBinding();
            Binding.TextField = valueColumnName;
            Binding.ValueField = idColumnName;
            Binding.Target = "#";
            TVOrg.DataBindings.Add(Binding);


            // Finally! Hook that bad boy up!       
            TVOrg.DataSource = XDdataSource;
            TVOrg.DataBind();
        }
        catch (Exception ex)
        {
            PNMsoft.Sequence.Diagnostics.DiagnosticUtility.EventLog.LogError(String.Format("TreeViewOrg.aspx:    FillTreeViewFromXML(), {0}", ex.Message));
        }
    }

protected void btnSubmit_Click(object sender, EventArgs e)
    {
        try
        {
            var entityIdHidden = this.FindControl<HiddenField>("SelectedNodeId");


            if (entityIdHidden != null)
                if (entityIdHidden.Value == "")
                    if (!CheckifSiteAlreadyExists())
                        return;


            if (!CheckIfEntityHasParent())
                return;


            var user = AuthenticationManager.LoggedInUser;
            WorkflowAPI api = new WorkflowAPI();


            Dictionary<string, object> entityFields = GetEntityControls();
            AttachmentEntity image = AttchmentItem("AsyncFileUpload2");


            if (image != null)
                entityFields.Add("fldImage", image);


            int entityId = 0;
            bool isSite = CheckIfEntityIsSite();
            if ((entityIdHidden != null) && (!string.IsNullOrEmpty(entityIdHidden.Value)))
            {
                int.TryParse(entityIdHidden.Value, out entityId);
            }
            api.UpdateACtivityFields(WorkflowInstanceId, user, this.GetFormUIViewModel().ActivityInstance, entityFields, entityId, "EntityType");


            List<DBParameter> prms = new List<DBParameter>();
            prms.Add(new DBParameter(System.Data.DbType.Int32, WorkflowInstanceId, "iwf"));
            prms.Add(new DBParameter(System.Data.DbType.Int32, entityId, "entityId"));
            int.TryParse(DBUtil.ExecuteScalar("USP_TEN_Entities_UpdateDynamicsValues", prms.ToArray(),
                CommandType.StoredProcedure).ToString(), out entityId);


            Dictionary<string, object> siteFields;
            if (isSite)
            {
                siteFields = GetSiteControls();
                siteFields.Add("fldParentid", entityId);
                api.UpdateACtivityFields(WorkflowInstanceId, user, this.GetFormUIViewModel().ActivityInstance, siteFields, entityId, "SiteDetails");
            }


            entityIdHidden.Value = entityId.ToString();
            this.CreateChildControls();


            //Response.Redirect(Request.RawUrl);
        }
        catch (Exception ex)
        {
            PNMsoft.Sequence.Diagnostics.DiagnosticUtility.EventLog.LogError(String.Format("TreeViewOrg.aspx:    btnSave_Click(), {0}", ex.Message));
        }
    }