DataSet、DataTable和DataGridView知识备忘

datatable中，获取第i行j列的单元格内容：
string str = DataSet.Tables[0].Rows[i][j].ToString()；
datagridview中，获取第i行j列的单元格内容：
string str =  DataGridview.Rows[i].Cells[j].Value.ToString()；

DataGridview的 SelectionMode 属性设置为 FullRowSelect 之后，获取指定单元格内容：
string str = DataGridview.CurrentRow.Cells[j].Value.ToString() ；

DataGridView 单击一次，即进入单元格编辑状态：
    this.dataGridView1.EditMode = System.Windows.Forms.DataGridViewEditMode.EditOnEnter；

datagridview 某一列自动适应列宽：
   this.dataGridView1.Columns[j].AutoSizeMode = DataGridViewAutoSizeColumnMode.AllCells;

datagridview 中按 enter 键光标跳至同列下一行

datatable中添加行：

方法一:
DataTable tblDatas = new DataTable("Datas");

DataColumn dc = null;
dc = tblDatas.Columns.Add("ID", Type.GetType("System.Int32"));
dc.AutoIncrement = true;//自动增加
dc.AutoIncrementSeed = 1;//起始为1
dc.AutoIncrementStep = 1;//步长为1
dc.AllowDBNull = false;//

dc = tblDatas.Columns.Add("Product", Type.GetType("System.String"));
dc = tblDatas.Columns.Add("Version", Type.GetType("System.String"));
dc = tblDatas.Columns.Add("Description", Type.GetType("System.String"));

DataRow newRow;
newRow = tblDatas.NewRow();
newRow["Product"] = "水果刀";
newRow["Version"] = "2.0";
newRow["Description"] = "打架专用";
tblDatas.Rows.Add(newRow);

newRow = tblDatas.NewRow();
newRow["Product"] = "折叠凳";
newRow["Version"] = "3.0";
newRow["Description"] = "行走江湖七武器之一";
tblDatas.Rows.Add(newRow);

方法二:

DataTable tblDatas = new DataTable("Datas");
tblDatas.Columns.Add("ID", Type.GetType("System.Int32"));
tblDatas.Columns[0].AutoIncrement = true;
tblDatas.Columns[0].AutoIncrementSeed = 1;
tblDatas.Columns[0].AutoIncrementStep = 1;

tblDatas.Columns.Add("Product", Type.GetType("System.String"));
tblDatas.Columns.Add("Version", Type.GetType("System.String"));
tblDatas.Columns.Add("Description", Type.GetType("System.String"));

tblDatas.Rows.Add(new object[]{null,"a","b","c"});
tblDatas.Rows.Add(new object[] { null, "a", "b", "c" });
tblDatas.Rows.Add(new object[] { null, "a", "b", "c" });
tblDatas.Rows.Add(new object[] { null, "a", "b", "c" });
tblDatas.Rows.Add(new object[] { null, "a", "b", "c" });

将 List<T>转换为datatable

public static DataTable ToDataTable<T>(IList<T> data)

{

PropertyDescriptorCollection properties = TypeDescriptor.GetProperties(typeof(T));

DataTable dt = new DataTable();

for (int i = 0; i < properties.Count; i++)

{

PropertyDescriptor property = properties[i];

dt.Columns.Add(property.Name, property.PropertyType);

}

object[] values = new object[properties.Count];

foreach (T item in data)

{

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

{

values[i] = properties[i].GetValue(item);

}

dt.Rows.Add(values);

}

return dt;

}