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;

 

        }

 

 

 

posted @ 2016-01-21 16:45  SharpCJ  阅读(629)  评论(0编辑  收藏  举报