Devexpress TreeList

[一篮饭特稀原创,转载请注明出处http://www.cnblogs.com/wanghafan/archive/2012/02/09/2344253.html]

--Devexpress TreeList 判断空

View Code

 1 repositoryItemTextEdit_费用名称是TreeList的某一列：
 2 
 3         /// 验证不为空_WHF_111201
 4 
 5 /// </summary>
 6 
 7 /// <param name="sender"></param>
 8 
 9 /// <param name="e"></param>
10 
11         private void repositoryItemTextEdit_费用名称_Validating(object sender, CancelEventArgs e)
12 
13         {
14 
15             if (sender != null)
16 
17             {
18 
19                 DevExpress.XtraEditors.TextEdit txt = sender as DevExpress.XtraEditors.TextEdit;
20 
21                 if (txt != null)
22 
23                 {
24 
25                     if (string.IsNullOrEmpty(txt.Text))
26 
27                         e.Cancel = true;
28 
29                 }
30 
31             }
32 
33         }

--Devexpress TreeList 绑定方式速度优化

View Code

 1 首先考虑代码中的字符串比较是否使用到 "==" 符号，该符号在string的比较中非常耗性能，如果存在则需要全部修改成 "Equal()"
 2 
 3 按照如上修改后一般速度有显著飞跃，如果还是很卡，参照如下方法：
 4 
 5 Devexrepss Treelist 常用绑定方式有两种：
 6 
 7 1.直接treeList.DataSource=dt;
 8 
 9 2.使用AppendNode逐条添加
10 
11 优缺点：
12 
13 1.绑定方便，但是速度很慢，特别表现在最大化最小化和关闭的时候，巨卡无比
14 
15 2.绑定复杂，但是速度很快，推荐使用
16 
17 下面贴出速度较快的第二种参考代码：
18 
19             TreeListNode parentNode = null;
20             TreeListNode childNode = null;
21 
22             treeList.BeginUnboundLoad();
23             treeList.ClearNodes();
24 
25             DataView treeDv = dt_F_表二费用表.DefaultView;
26             DataTable parentDt = null;
27             DataTable childDt = null;
28             parentDt = treeDv.ToTable();
29             foreach (DataRow parentDr in parentDt.Rows)
30             {
31                 parentNode = this.treeList.AppendNode(new object[] { parentDr["IID"], parentDr["上级费用ID"] }, 0);
32 
33                 treeDv = new DataView(dt_F_表二费用表);
34                 treeDv.RowFilter = "上级费用ID='" + parentDr["IID"].ToString() + "'";
35                 childDt = treeDv.ToTable();
36                 foreach (DataRow childDr in childDt.Rows)
37                 {
38                     childNode = this.treeList.AppendNode(new object[] { childDr["IID"], childDr["上级费用ID"] }, parentNode);
39                 }
40             }
41 
42             treeList.EndUnboundLoad();
43             treeList.ExpandAll();

--Devexpress TreeList 删除

View Code

 1  treeList_Project是TreeList，无论点击3级节点的某个节点，都可以把根节点一起删除
 2 
 3       private void btn_RemoveProject_Click(object sender, EventArgs e)
 4         {
 5             if (treeList_Project.FocusedNode == null)
 6                 return;
 7             TreeListNode keyNode=null;
 8             switch (treeList_Project.FocusedNode.Level)
 9             {
10                 case 0:
11                     keyNode = treeList_Project.FocusedNode;
12                     break;
13                 case 1:
14                     keyNode = treeList_Project.FocusedNode.ParentNode;
15                     break;
16                 case 2:
17                     keyNode = treeList_Project.FocusedNode.ParentNode.ParentNode;
18                     break;
19             }
20             treeList_Project.Nodes.Remove(keyNode);            
21         }

--Devexpress TreeList 绑定后锁定绑定前行

View Code

1  int currFocusedRow = treeList_left.GetNodeIndex(treeList_left.FocusedNode);
2 
3 //--绑定Binding刷新treeList
4 
5 treeList_left.FocusedNode = treeList_left.GetNodeByVisibleIndex(currFocusedRow);

--Devexpress TreeList Check一二级可编辑其他级不可编辑

View Code

 1 代码界面：
 2 private void treeList_CustomNodeCellEdit(object sender, DevExpress.XtraTreeList.GetCustomNodeCellEditEventArgs e)
 3           {
 4               if (e.Node.Level == 0 || e.Node.Level == 1 || e.Node.Level == 2)
 5               {
 6                   if (e.Column.FieldName == "ItGet")
 7                   {
 8                       e.RepositoryItem = repositoryItemCheckEdit_ItGet_0;                    
 9                   }
10                   else
11                   {
12                       e.RepositoryItem = repositoryItemTextEdit_ReadOnly;
13                   }
14               }
15               else
16               {
17                   if (e.Column.FieldName == "ItGet")
18                   {
19                       e.RepositoryItem = repositoryItemCheckEdit_ItGet_1;                    
20                   }
21               }
22          }
23   
24 设计页面：
25 
26   this.repositoryItemCheckEdit_ItGet_1.CheckStyle = DevExpress.XtraEditors.Controls.CheckStyles.Standard;
27   
28   this.repositoryItemCheckEdit_ItGet_0.CheckStyle = DevExpress.XtraEditors.Controls.CheckStyles.UserDefined;
29   this.repositoryItemCheckEdit_ItGet_0.ReadOnly = true;
30   this.repositoryItemCheckEdit_ItGet_0.AllowFocused = false;