[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：
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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;