DataGridView控件-学习笔记总结

1、GridColor属性用来获取或设置网格线的颜色

dataGridView1.GridColor=Color.Blue;

2、设置宽度 、高度

dataGridView1.Columns[0].Width=200;
dataGridView1.Rows[0].Height = 100;

3、设置字体

dataGridView1.DefaultCellStyle.Font = new Font("隶书",14);
dataGridView1.Columns[0].DefaultCellStyle.Font = new Font("宋体", 12);
dataGridView1.Rows[1].DefaultCellStyle.Font = new Font("行楷", 13);

4、设置货币在DataGridView控件中的显示

dataGridView1.Columns[2].DefaultCellStyle.Format = "c";

5、设置DataGridView单元格的文本对齐方式

dataGridView1.Columns[1].DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleCenter;

6、DataGridView控件可编辑的时候验证数据输入

 private void dataGridView1_CellValidating(object sender, DataGridViewCellValidatingEventArgs e)
        {
            if (e.ColumnIndex == 1)
            {
                int result = 0;
                string before = dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Value.ToString();
                if(!int.TryParse(e.FormattedValue.ToString(),out result))
                {
                    dataGridView1.Rows[e.RowIndex].ErrorText = "年龄必须为数值类型";
                    e.Cancel = true;
                }
            }
        }

7、获取DataGridView控件中鼠标单击表格任意单元格的文本

//单击单元格
        private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)
        {
            //MessageBox.Show(dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Value.ToString());
        }

//单击单元格内容
        private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {
            MessageBox.Show(dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Value.ToString());
        }

8、在单元格中换行

dataGridView1.DefaultCellStyle.WrapMode=DataGridViewTriState.True;

 

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace DataGridView
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void btn_GridColor_Click(object sender, EventArgs e)
        {
            dgv_ShowGridColor.DataSource = new List<Student>()
            {
                new Student("张三",12,1000),
                new Student("李四",18,4000),
                new Student("王五",16,3000)
            };
            //设置表头文本
            dgv_ShowGridColor.Columns[0].HeaderText = "姓名";
            dgv_ShowGridColor.Columns[1].HeaderText = "年龄";
            //设置列宽度
            dgv_ShowGridColor.Columns[0].Width = 100;
            dgv_ShowGridColor.Columns[1].Width = 70;
            //设置网格线颜色
            dgv_ShowGridColor.GridColor = Color.Blue;
            //设置全局字体
            dgv_ShowGridColor.Font = new Font("隶书", 12);
            //设置数据字体
            dgv_ShowGridColor.DefaultCellStyle.Font = new Font("楷体", 11);
            //设置数字数据显示  
            dgv_ShowGridColor.Columns[2].DefaultCellStyle.Format = "c";
            //设置数据填充样式 dgv的宽度一定要够长
            dgv_ShowGridColor.Columns[0].AutoSizeMode = DataGridViewAutoSizeColumnMode.AllCells;
            //设置对齐样式
            dgv_ShowGridColor.Columns[0].DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleCenter;
            //全局对齐样式
            //dgv_ShowGridColor.DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleCenter;
            //换行显示过长文本
            dgv_ShowGridColor.DefaultCellStyle.WrapMode = DataGridViewTriState.True;
            //设置行高
            //dgv_ShowGridColor.Rows[2].Height = 100;
            ////添加列
            //dgv_ShowGridColor.Columns.Add("day", "日期");
            //dgv_ShowGridColor.Columns.Remove("day");
            //禁止添加行和列
            //dgv_ShowGridColor.AllowUserToAddRows = false;
            //dgv_ShowGridColor.AllowUserToDeleteRows = false;
            //自动排序
            //for (int i = 0; i < dgv_ShowGridColor.Columns.Count; i++)
            //{
            //    dgv_ShowGridColor.Columns[i].SortMode = DataGridViewColumnSortMode.Automatic;
            //}
            //隔行换色
            //for (int i = 0; i < dgv_ShowGridColor.Rows.Count; i++)
            //{
            //    if (i % 2 == 0)
            //    {
            //        dgv_ShowGridColor.Rows[i].DefaultCellStyle.BackColor = Color.Gray;
            //    }
            //}
            
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            //SqlConnection myConn = new SqlConnection("server=(local);database=testDB;integrated security=true");
            //SqlDataAdapter mysda = new SqlDataAdapter("select * from student", myConn);
            //DataSet ds = new DataSet();
            //mysda.Fill(ds);
            //dgv_ShowGridColor.DataSource = ds.Tables[0];
            ////dgvData.RowHeadersVisible = false;
            ////btnAdd.Enabled = false;
            //dgv_ShowGridColor.Columns[0].ReadOnly = true;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            dgv_ShowGridColor.DataSource = new List<Images>()
            {
                new Images(){_Im=Image.FromFile(System.Environment.CurrentDirectory+"\Image\1.bmp")},
                new Images(){_Im=Image.FromFile(System.Environment.CurrentDirectory+"\Image\2.bmp")},
                new Images(){_Im=Image.FromFile(System.Environment.CurrentDirectory+"\Image\3.bmp")},
                new Images(){_Im=Image.FromFile(System.Environment.CurrentDirectory+"\Image\4.bmp")},
                new Images(){_Im=Image.FromFile(System.Environment.CurrentDirectory+"\Image\5.bmp")},
                new Images(){_Im=Image.FromFile(System.Environment.CurrentDirectory+"\Image\6.bmp")},
                new Images(){_Im=Image.FromFile(System.Environment.CurrentDirectory+"\Image\7.bmp")}
            };
            dgv_ShowGridColor.Columns[0].HeaderText = "图片";
            dgv_ShowGridColor.Columns[0].Width = 70;
            for (int i = 0; i < dgv_ShowGridColor.Rows.Count; i++)
            {
                dgv_ShowGridColor.Rows[i].Height = 70;
            }
        }
    }
    class Student
    {
        private string name;
        private int age;
        private int money;
        public string _Name
        {
            get;
            set;
        }
        public int _Age
        {
            get;
            set;
        }
        public int _Money
        {
            get;
            set;
        }
        public Student(string name, int age,int money)
        {
            this._Name = name;
            this._Age = age;
            this._Money = money;
        }
    }
    class Images
    {
        private Image im;
        public Image _Im
        {
            get;
            set;
        }
    }
}

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace DataGridView中添加合计和平均值
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        List<Fruit> fruit;
        private void button1_Click(object sender, EventArgs e)
        {
            fruit = new List<Fruit>() 
            {
                new Fruit(){Name="ada",Price=12},
                new Fruit(){Name="adfa",Price=23},
                new Fruit(){Name="fddd",Price=22}
            };
            dataGridView1.Columns.Add("Fruit", "水果");
            dataGridView1.Columns.Add("Price", "价格");
            //dataGridView1.DataSource = fruit;
            foreach (Fruit f in fruit)
            {
                dataGridView1.Rows.Add(new string[]
                {
                    f.Name,
                    f.Price.ToString()
                });
            }
            float sum = 0;
            fruit.ForEach(
                (pp) =>
                {
                    sum += pp.Price;
                }
                );
            dataGridView1.Rows.Add(new string[]{
                "合计："+sum.ToString(),"均价："+(sum/fruit.Count).ToString()
            });
        }
    }
    class Fruit
    {
        private string name;
        private int price;
        public string Name
        {
            get;
            set;
        }
        public int Price
        {
            get;
            set;
        }
    }
}

eg

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.SqlClient;
using System.Data;

namespace _19事务01
{
    class SqlHelper
    {
        public static bool ExecDataBySqls(List<string> strSqls, string strConn)
        {
            SqlConnection sqlConn = new SqlConnection(strConn);
            bool boolIsSucceed = false;
            SqlCommand sqlCmd = new SqlCommand();
            sqlCmd.Connection = sqlConn;
            if (sqlConn.State == ConnectionState.Closed)
            {
                sqlConn.Open();
            }
            SqlTransaction sqlTran = sqlConn.BeginTransaction();//启动一个事务
            try
            {
                sqlCmd.Transaction = sqlTran;//为事务创建一个命令
                foreach (string item in strSqls)
                {
                    sqlCmd.CommandType = CommandType.Text;
                    sqlCmd.CommandText = item;
                    sqlCmd.ExecuteNonQuery();
                }
                sqlTran.Commit();//提交事务
                boolIsSucceed = true;
            }
            catch
            {
                sqlTran.Rollback();//回滚事务，恢复数据
                boolIsSucceed = false;
            }
            finally
            {
                sqlConn.Close();
                strSqls.Clear();
            }
            return boolIsSucceed;
        }
        public static DataSet DataBanding(string connStr,string selectCmdText)
        {
            using (SqlConnection conn = new SqlConnection(connStr))
            {
                if (conn.State == ConnectionState.Closed)
                {
                    conn.Open();
                }
                SqlDataAdapter sda = new SqlDataAdapter(selectCmdText, conn);
                DataSet ds = new DataSet();
                sda.Fill(ds, "Student");
                return ds;
            }
        }
    }
}

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;

namespace _19事务01
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        string connStr = "Server=(local);DataBase=testDB;Integrated Security=true";
        string selectCmdText = "select * from Student";
        private void Form1_Load(object sender, EventArgs e)
        {
           
            dataGridView1.DataSource = SqlHelper.DataBanding(connStr, selectCmdText).Tables[0];
        }

        private void button1_Click(object sender, EventArgs e)
        {
            List<string> strSqls = new List<string>();
            string strDelete =string.Format("delete from student where stuNumber='{0}'",txtDStuNumber.Text);
            string strInsert = string.Format("insert into student values('{0}','{1}',{2})", txtStuNumber.Text, txtStuName.Text, txtStuAge.Text);
            string strSelect = "select * from student where stuNumber='2010181055'";
            strSqls.Add(strDelete);
            strSqls.Add(strInsert);
            strSqls.Add(strSelect);
            if (SqlHelper.ExecDataBySqls(strSqls, connStr))
            {
                MessageBox.Show("事务执行成功");
            }
            //dataGridView1.DataSource = SqlHelper.DataBanding(connStr, selectCmdText).Tables[0];
            Form1_Load(sender,e);
            MessageBox.Show("加载成功");
        }
    }
}

using(SqlConnection myConn=new SqlConnection(connectionText))
{
if(myConn.State==ConnectionState.Closed)
{
myConn.Open();
}
//将数据显示到DataGridView中
string selectCommandText = "select * from student";
SqlDataAdapter mySDA = new SqlDataAdapter(selectCommandText,myConn);
DataSet myDS = new DataSet();
mySDA.Fill(myDS,"student");
dgvShow.DataSource=myDS.Tables[0];
//DataTable myDT = new DataTable();
//for (int i = 0; i < dgvShow.Rows.Count;i++ )
//{

//}
}