TOMMYHU

//新增记录，推荐使用，光标位置处于当前新增记录，且正处理编辑状态
DataRow thisRow = ((DataRowView)usersBindingSource.AddNew()).Row;
thisRow["OID"] = 5;
thisRow["CNAME"] = "新增用户";
thisRow["sex"] = "m";

//新增记录(不建议使用，因为这种方式Rows.Add时并不处于编辑状态时会受约束影响，且新增时光标不会自动移动该条记录) 
DataRow thisRow = userDataSet.Tables["Users"].NewRow();
thisRow["OID"] = 5;
thisRow["CNAME"] = "新增用户";
thisRow["sex"] = "m";
userDataSet.Tables["Users"].Rows.Add(thisRow);

if (usersBindingSource.Current != null)
   //删除当前记录，推荐使用
   usersBindingSource.RemoveCurrent();

//删除当前记录,不推荐使用，这种方式不会记录到RowState中，保存时不会更新
DataRow thisRow = getCurrentDataRow(usersBindingSource);
if (thisRow != null)
   userDataSet.Tables["Users"].Rows.Remove(thisRow);

//删除当前记录,不推荐使用，BindingSource可以更简洁
DataRow thisRow = getCurrentDataRow(usersBindingSource);
if (thisRow != null)
   thisRow.Delete();

DataRow thisRow = getCurrentDataRow(usersBindingSource);

if (thisRow != null)
{
   thisRow.BeginEdit();
   thisRow["CNAME"] = "修改的名称";
   thisRow.EndEdit();
}

DataColumn[] keys = new DataColumn[1];
keys[0] = userDataSet.Tables["Users"].Columns["OID"];
userDataSet.Tables["Users"].PrimaryKey = keys;
DataRow findRow = userDataSet.Tables["Users"].Rows.Find("1");

if (findRow == null)
{
   MessageBox.Show("没有找到");
}
else
{
   MessageBox.Show("成功找到,CNAME = " + findRow["CNAME"]);
} 

int i = usersBindingSource.Find("OID", "1");

if (i >= 0)
   MessageBox.Show("成功找到,CNAME = " +
   userDataSet.Tables["users"].Rows[i]["CNAME"]);

DataRow[] AryDr = userDataSet.Tables["users"].Select("OID > 1");

for (int i = 0; i < AryDr.Length; i++)
{
    DataRow dr = AryDr[i];
    MessageBox.Show(Convert.ToString((int)dr["OID"]));
}

//指定定位到哪一行,Position不会随表格列排序而变化，0不一定就是表格的第一行

usersBindingSource.Position = 0;

//移动到上一条,对于表格列排序后，上一条不定是界面显示表格的上一条

usersBindingSource.MovePrevious();

usersBindingSource.MoveNext();//移动到下一条

usersBindingSource.MoveFirst();

usersBindingSource.MoveLast();

usersBindingSource.Filter = "OID > 1";

userDataSet.Tables["users"].Clear();

userDataSet.Tables["users"].Rows.Clear();

while (usersBindingSource.Current != null)
      usersBindingSource.RemoveCurrent();

DataSet copyDS = userDataSet.Copy();

DataSet copyDS = new DataSet();
copyDS.Tables.Add(userDataSet.Tables["users"].Copy());

copyDS = userDataSet.Clone();
MessageBox.Show(copyDS.Tables["users"].Rows.Count.ToString());

copyDS = userDataSet.GetChanges();

DataTable dt = userDataSet.Tables["users"].GetChanges();

ds.Merge(userDataSet);

ds.Merge(userDataSet.Tables["users"]);

userDataSet.RejectChanges();

userDataSet.Tables["users"].RejectChanges();

DataRow dr = getCurrentDataRow(usersBindingSource);

if (dr != null)
   dr.RejectChanges();

this.usersTableAdapter.Fill(this.userDataSet.Users);

this.Validate();
this.usersBindingSource.EndEdit();

if (this.userDataSet.HasChanges())
{
   this.usersTableAdapter.Update(this.userDataSet.Users);
   MessageBox.Show("保存成功!");
}

DataColumnCollection dcc = userDataSet.Tables["users"].Columns;

for (int i = 0; i < dcc.Count; i++)
{
    DataColumn dc = dcc[i];
    MessageBox.Show(dc.ColumnName);
}

DataRowCollection drc = userDataSet.Tables["users"].Rows;

for (int i = 0; i < drc.Count; i++)
{
    DataRow dr = drc[i];
    MessageBox.Show((string)dr["CNAME"]);
}