DataTable

[一篮饭特稀原创，转载请注明出处http://www.cnblogs.com/wanghafan/archive/2012/05/07/2487635.html]

删除行

View Code

1     protected void deleteDataRow(int RowID,DataTable dt)

2     {

3         for (int i = dt.Rows.Count - 1; i >= 0; i--)

4         {

5             if (Convert.ToInt32(dt.Rows[i]["RowID"]) == RowID)

6                 dt.Rows.RemoveAt(i);

7         }

8     }

 批量删除行

View Code

 1 DataTable dt = new DataTable(); 

 2 int len = dt.Rows.Count;

 3 for (int i = len; i >=0; i--)

 4 {

 5     if (((CheckBox)Rp.Items[i].FindControl("CB")).Checked)

 6     {

 7          dt.Rows[i].Delete();

 8     }

 9 }

10 dt.AcceptChanges();     //提交对表进行的修改

错误 该行已经属于另一个表

View Code

 1 从一个TABLE中取一行放到另一个TABLE里报错： 该行已经属于另一个表。

 2 DataTable dt = new DataTable();

 3 

 4 dt = ds.Tables[0].Clone(); //克隆结构传递给dt

 5 

 6 DataRow[] dr=dtOld["Product"].Select("ProjectID=1"); //通过条件得到符合条件的行

 7 for(int i=0;i<dr.Length;i++)

 8 {

 9      //将数组元素加入表...

10      dt.Rows.Add(dr[i]); //出错提示为:该行已经属于另一个表 改成 dt.Rows.Add(dr[i].ItemArray);

11 }

对DataTable进行操作后如果赋值给DataSource务必要先AcceptChange

View Code

1  比如对DataTable进行排序后，如果直接复制给DataSource，会出现DataTable的所有行状态RowState==DataRowState.Added，使得在保存后不知不觉中出现双份数据导致键值冲突！

2 

3    e.g.

4    DataView dv = dt_KeyWeightQuestionsTEO.DefaultView;

5    dv.Sort = "ParentID,OwnID";

6    dt_KeyWeightQuestionsTEO = dv.ToTable();

7    dt_KeyWeightQuestionsTEO.AcceptChanges();   <----- 关键

8    treeList.DataSource = dt_KeyWeightQuestionsTEO;

添加一自增列至首列

View Code

1 DataColumn dcIID=new DataColumn("IID", System.Type.GetType("System.Int32"));

2 dcIID.AutoIncrement = true;

3 dcIID.AutoIncrementSeed = 1;

4 dcIID.AutoIncrementStep = 1;

5 dcIID.ReadOnly = true;

6 dt.Columns.Add(dcIID);

利用 栈 实现 多行多次 撤销 Ctrl+Z 

View Code

  1 using System;

  2 using System.Collections.Generic;

  3 using System.ComponentModel;

  4 using System.Data;

  5 using System.Drawing;

  6 using System.Text;

  7 using System.Windows.Forms;

  8 using DevExpress.Utils.Commands;

  9 

 10 namespace StackProgram

 11 {

 12     public partial class StackProgram : Form

 13     {

 14         private int stackLength = 3; //撤销上限        

 15         Stack<List<DataRow>> st_DataRow = new Stack<List<DataRow>>();  //栈     

 16 

 17         public StackProgram()

 18         {

 19             InitializeComponent();

 20             DataTable dt = new DataTable();

 21             dt.Columns.Add("IID", Type.GetType("System.Int32"));

 22             dt.Columns.Add("IName", Type.GetType("System.String"));

 23             for (int i = 1; i <= 5; i++)

 24             {

 25                 DataRow dr = dt.NewRow();

 26                 dr["IID"] = i;

 27                 dr["IName"] = "Name_"+i;

 28                 dt.Rows.Add(dr);

 29             }

 30             dt.AcceptChanges();

 31             gridControl1.DataSource = dt;

 32         }

 33 

 34         private void gridControl1_KeyDown(object sender, KeyEventArgs e)

 35         {

 36             if (e.Control && e.KeyCode.ToString().Equals("Z") && st_DataRow.Count > 0)

 37             {

 38                 List<DataRow> li_dr = st_DataRow.Pop();

 39                 if (li_dr.Count==1) //添加或修改或删除

 40                 {

 41                     if (li_dr[0].RowState.Equals(DataRowState.Added) || li_dr[0].RowState.Equals(DataRowState.Modified) || li_dr[0].RowState.Equals(DataRowState.Deleted))

 42                     {

 43                         li_dr[0].RejectChanges();

 44                     }

 45                 }

 46                 else //批量删除

 47                 {

 48                     foreach (DataRow dr in li_dr)

 49                     {

 50                         dr.RejectChanges();

 51                     }

 52                 }

 53                 System.Windows.Forms.SendKeys.SendWait("{BS}"); //强制按下退格键可以取消该行的编辑状态!!!               

 54             }

 55         }

 56 

 57         private void gridControl1_EmbeddedNavigator_ButtonClick(object sender, DevExpress.XtraEditors.NavigatorButtonClickEventArgs e)

 58         {

 59             if (e.Button.Hint.Equals("添加"))

 60             {

 61                 gridView1.AddNewRow();

 62                 OverStack();

 63                 List<DataRow> li_dr = new List<DataRow>();

 64                 li_dr.Add(gridView1.GetDataRow(gridView1.FocusedRowHandle));

 65                 st_DataRow.Push(li_dr);

 66             }

 67             if (e.Button.Hint.Equals("删除"))

 68             {

 69                 OverStack();

 70                 List<DataRow> li_dr = new List<DataRow>();

 71                 foreach (int i in gridView1.GetSelectedRows())

 72                 {

 73                     li_dr.Add(gridView1.GetDataRow(i));

 74                 }               

 75                 st_DataRow.Push(li_dr);

 76                 gridView1.DeleteSelectedRows();

 77             }

 78         }

 79 

 80         private void gridView1_CellValueChanged(object sender, DevExpress.XtraGrid.Views.Base.CellValueChangedEventArgs e)

 81         {

 82             if (!gridView1.GetDataRow(gridView1.FocusedRowHandle).RowState.Equals(DataRowState.Detached)) //新增的行立即修改时不能算作编辑的行

 83             {

 84                 OverStack();

 85                 List<DataRow> li_dr = new List<DataRow>();

 86                 li_dr.Add(gridView1.GetDataRow(gridView1.FocusedRowHandle));

 87                 st_DataRow.Push(li_dr);

 88             }

 89         }

 90         

 91         private void OverStack()

 92         {

 93             if (st_DataRow.Count>0 && st_DataRow.Count >= stackLength) //大于栈空间时，删除栈底元素，更新栈顶元素

 94             {

 95                 List<List<DataRow>> li_li_row = new List<List<DataRow>>();

 96                 foreach (List<DataRow> li_dr in st_DataRow) //复制原有栈元素

 97                 {

 98                     li_li_row.Add(li_dr);

 99                 }

100                 li_li_row.Reverse(); //反转

101                 li_li_row.RemoveAt(0); //删除栈底元素

102                 st_DataRow.Clear(); //清空所有栈元素

103                 foreach (List<DataRow> li_dr in li_li_row) //重新入栈

104                 {

105                     st_DataRow.Push(li_dr);

106                 }

107             }

108         }

109     }

110 }

DataView的RowFilter注入攻击

View Code

 1  public static string EncodeString(string s) 

 2         { 

 3             StringBuilder sb = new StringBuilder(); 

 4             for (int i = 0; i < s.Length; i++) 

 5             { char c = s[i]; if (c == '*' || c == '%' || c == '[' || c == ']')             

 6                 sb.Append("[").Append(c).Append("]"); else if (c == '\'')            

 7                 sb.Append("''"); else             

 8                 sb.Append(c); } return sb.ToString(); 

 9         } 

10 

11    dv.RowFilter = String.Format(

12                            "名称='{0}' and 规格型号='{1}' and 单价='{2}' and 段ID='{3}'  and 编码='{4}'",

13                            Global.EncodeString(dr["名称"].ToString().Trim()),

14                            Global.EncodeString(dr["规格型号"].ToString().Trim()),

15                            Global.EncodeString(dr["单价"].ToString().Trim()),

16                            dr["段ID"].ToString().Trim() == string.Empty ? "0" : dr["段ID"].ToString().Trim(),

17                             Global.EncodeString(dr["编码"].ToString().Trim())

18                           );