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

    protected void deleteDataRow(int RowID,DataTable dt)
    {
        for (int i = dt.Rows.Count - 1; i >= 0; i--)
        {
            if (Convert.ToInt32(dt.Rows[i]["RowID"]) == RowID)
                dt.Rows.RemoveAt(i);
        }
    }

 批量删除行

DataTable dt = new DataTable(); 
int len = dt.Rows.Count;
for (int i = len; i >=0; i--)
{
    if (((CheckBox)Rp.Items[i].FindControl("CB")).Checked)
    {
         dt.Rows[i].Delete();
    }
}
dt.AcceptChanges();     //提交对表进行的修改

错误 该行已经属于另一个表

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。
DataTable dt = new DataTable();

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

DataRow[] dr=dtOld["Product"].Select("ProjectID=1"); //通过条件得到符合条件的行
for(int i=0;i<dr.Length;i++)
{
     //将数组元素加入表...
     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);
}

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

 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！

   e.g.
   DataView dv = dt_KeyWeightQuestionsTEO.DefaultView;
   dv.Sort = "ParentID,OwnID";
   dt_KeyWeightQuestionsTEO = dv.ToTable();
   dt_KeyWeightQuestionsTEO.AcceptChanges();   <----- 关键
   treeList.DataSource = dt_KeyWeightQuestionsTEO;

添加一自增列至首列

DataColumn dcIID=new DataColumn("IID", System.Type.GetType("System.Int32"));
dcIID.AutoIncrement = true;
dcIID.AutoIncrementSeed = 1;
dcIID.AutoIncrementStep = 1;
dcIID.ReadOnly = true;
dt.Columns.Add(dcIID);

利用 栈 实现 多行多次 撤销 Ctrl+Z 

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using DevExpress.Utils.Commands;

namespace StackProgram
{
    public partial class StackProgram : Form
    {
        private int stackLength = 3; //撤销上限        
        Stack<List<DataRow>> st_DataRow = new Stack<List<DataRow>>();  //栈     

        public StackProgram()
        {
            InitializeComponent();
            DataTable dt = new DataTable();
            dt.Columns.Add("IID", Type.GetType("System.Int32"));
            dt.Columns.Add("IName", Type.GetType("System.String"));
            for (int i = 1; i <= 5; i++)
            {
                DataRow dr = dt.NewRow();
                dr["IID"] = i;
                dr["IName"] = "Name_"+i;
                dt.Rows.Add(dr);
            }
            dt.AcceptChanges();
            gridControl1.DataSource = dt;
        }

        private void gridControl1_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.Control && e.KeyCode.ToString().Equals("Z") && st_DataRow.Count > 0)
            {
                List<DataRow> li_dr = st_DataRow.Pop();
                if (li_dr.Count==1) //添加或修改或删除
                {
                    if (li_dr[0].RowState.Equals(DataRowState.Added) || li_dr[0].RowState.Equals(DataRowState.Modified) || li_dr[0].RowState.Equals(DataRowState.Deleted))
                    {
                        li_dr[0].RejectChanges();
                    }
                }
                else //批量删除
                {
                    foreach (DataRow dr in li_dr)
                    {
                        dr.RejectChanges();
                    }
                }
                System.Windows.Forms.SendKeys.SendWait("{BS}"); //强制按下退格键可以取消该行的编辑状态!!!               
            }
        }

        private void gridControl1_EmbeddedNavigator_ButtonClick(object sender, DevExpress.XtraEditors.NavigatorButtonClickEventArgs e)
        {
            if (e.Button.Hint.Equals("添加"))
            {
                gridView1.AddNewRow();
                OverStack();
                List<DataRow> li_dr = new List<DataRow>();
                li_dr.Add(gridView1.GetDataRow(gridView1.FocusedRowHandle));
                st_DataRow.Push(li_dr);
            }
            if (e.Button.Hint.Equals("删除"))
            {
                OverStack();
                List<DataRow> li_dr = new List<DataRow>();
                foreach (int i in gridView1.GetSelectedRows())
                {
                    li_dr.Add(gridView1.GetDataRow(i));
                }               
                st_DataRow.Push(li_dr);
                gridView1.DeleteSelectedRows();
            }
        }

        private void gridView1_CellValueChanged(object sender, DevExpress.XtraGrid.Views.Base.CellValueChangedEventArgs e)
        {
            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
            {
                OverStack();
                List<DataRow> li_dr = new List<DataRow>();
                li_dr.Add(gridView1.GetDataRow(gridView1.FocusedRowHandle));
                st_DataRow.Push(li_dr);
            }
        }
        
        private void OverStack()
        {
            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
            {
                List<List<DataRow>> li_li_row = new List<List<DataRow>>();
                foreach (List<DataRow> li_dr in st_DataRow) //复制原有栈元素
                {
                    li_li_row.Add(li_dr);
                }
                li_li_row.Reverse(); //反转
                li_li_row.RemoveAt(0); //删除栈底元素
                st_DataRow.Clear(); //清空所有栈元素
                foreach (List<DataRow> li_dr in li_li_row) //重新入栈
                {
                    st_DataRow.Push(li_dr);
                }
            }
        }
    }
}

DataView的RowFilter注入攻击

 public static string EncodeString(string s) 
        { 
            StringBuilder sb = new StringBuilder(); 
            for (int i = 0; i < s.Length; i++) 
            { char c = s[i]; if (c == '*' || c == '%' || c == '[' || c == ']')             
                sb.Append("[").Append(c).Append("]"); else if (c == '\'')            
                sb.Append("''"); else             
                sb.Append(c); } return sb.ToString(); 
        } 

   dv.RowFilter = String.Format(
                           "名称='{0}' and 规格型号='{1}' and 单价='{2}' and 段ID='{3}'  and 编码='{4}'",
                           Global.EncodeString(dr["名称"].ToString().Trim()),
                           Global.EncodeString(dr["规格型号"].ToString().Trim()),
                           Global.EncodeString(dr["单价"].ToString().Trim()),
                           dr["段ID"].ToString().Trim() == string.Empty ? "0" : dr["段ID"].ToString().Trim(),
                            Global.EncodeString(dr["编码"].ToString().Trim())
                          );