利用datagridview在前端界面操作数据表

一、知识点描述

DataGridViewRow row = new DataGridViewRow();是创建DataGridView的行对象，

DataGridViewTextBoxCell是单元格的内容是个TextBox，

DataGridViewComboBoxCell是单元格的内容是下拉列表框，

DataGridViewButtonCell是单元格的内容是个按钮，等等。

 

1、DataGridView 行的用户删除操作的自定义：

 

1）无条件的限制行删除操作。
默认时，DataGridView 是允许用户进行行的删除操作的。如果设置DataGridView对象的AllowUserToDeleteRows属性为 False 时，用户的行删除操作就被禁止了。

// 禁止DataGridView1的行删除操作。
DataGridView1.AllowUserToDeleteRows = false;
但是，通过 DataGridViewRowCollection.Remove 还是可以进行删除。
补足： 如果 DataGridView 绑定的是 DataView 的话，通过DataView.AllowDelete 也可以控制行的删除。

2）行删除时的条件判断处理。
用户在删除行的时候，将会引发 DataGridView.UserDeletingRow 事件。在这个事件里，可以判断条件并取消删除操作。

// DataGridView1 的 UserDeletingRow 事件
private void DataGridView1_UserDeletingRow( object sender, DataGridViewRowCancelEventArgs e)
{
// 删除前的用户确认。
if (MessageBox.Show("确认要删除该行数据吗？", "删除确认",
MessageBoxButtons.OKCancel, MessageBoxIcon.Question) != DialogResult.OK)
{
// 如果不是 OK，则取消。
e.Cancel = true;
}
}

2、DataGridView 取得或者修改当前单元格的内容：

当前单元格指的是 DataGridView 焦点所在的单元格，它可以通过 DataGridView 对象的 CurrentCell 属性取得。如果当前单元格不存在的时候，返回Nothing(C#是null)

// 取得当前单元格内容
Console.WriteLine(DataGridView1.CurrentCell.Value);
// 取得当前单元格的列 Index
Console.WriteLine(DataGridView1.CurrentCell.ColumnIndex);
// 取得当前单元格的行 Index

二、思维导图

 

三、示例代码

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 护士工作站2

{

    public partial class 药品使用 : Form

    {

        private DataTable MedicineTable;

        private DataTable SelectMedicineTable;

 

        public 药品使用()

        {

            InitializeComponent();

            this.StartPosition = FormStartPosition.CenterScreen;                                           

            this.dgv_Medicine.ReadOnly = true;                                                                

            this.dgv_Medicine.AllowUserToAddRows = false;

//课程数据网格视图不允许用户添加行；                                                    

            this.dgv_Medicine.RowHeadersVisible = false;                                                      

            this.dgv_Medicine.BackgroundColor = Color.White;                                                 

            this.dgv_Medicine.AutoSizeColumnsMode =

                DataGridViewAutoSizeColumnsMode.AllCells;                                                  

            this.dgv_SelectMedicine.AllowUserToAddRows = false;        //已选课程数据网格视图不允许用户添加行；

            this.dgv_SelectMedicine.RowHeadersVisible = false;         //已选课程数据网格视图的行标题不可见；

            this.dgv_SelectMedicine.BackgroundColor = Color.LightBlue;       

            this.dgv_SelectMedicine.AutoSizeColumnsMode =

                DataGridViewAutoSizeColumnsMode.AllCells; 

        }

 

       private void btn_Load_Click(object sender, EventArgs e)

        {

            SqlConnection sqlConnection = new SqlConnection();                                             

            sqlConnection.ConnectionString =

                "Server=(local);Database=Edubase2018;Integrated Security=sspi";                                        SqlCommand sqlCommand = new SqlCommand();                                                      

            sqlCommand.Connection = sqlConnection;                                                         

            sqlCommand.CommandText =

                "SELECT Kind_no,Drug_name,Ind_price FROM tb_Medicine WHERE Kind_no NOT IN"

                + "(SELECT Kind_no FROM tb_SelectMedicine WHERE AdmissionNo=@AdmissionNo);";                        sqlCommand.Parameters.AddWithValue("@AdmissionNo", this.txb_no.Text.Trim());                                

            SqlDataAdapter sqlDataAdapter = new SqlDataAdapter();                                          

            sqlDataAdapter.SelectCommand = sqlCommand;                                                      ；

            this.MedicineTable = new DataTable();                                                            

            this.SelectMedicineTable = new DataTable();                                                    

            sqlConnection.Open();                                                                          

            sqlDataAdapter.Fill(this.MedicineTable);                                                         

            sqlCommand.CommandText =

                "SELECT C.Kind_no,C.Drug_name,C.Ind_price,C.OrderMedicine"

                + " FROM tb_Medicine AS C JOIN tb_SelectMedicine AS CS ON C.Kind_no=CS.Kind_no"

                + " WHERE AdmissionNo=@AdmissionNo;";                                                          

            sqlDataAdapter.Fill(this.SelectMedicineTable);                                                 

            sqlConnection.Close();                                                                         

            this.dgv_Medicine.Columns.Clear();                                                                

            this.dgv_Medicine.DataSource = this.MedicineTable;                                                 

            this.dgv_Medicine.Columns["Kind_no"].HeaderText = "编号";                            

            this.dgv_Medicine.Columns["Drug_name"].HeaderText = "名称";

            this.dgv_Medicine.Columns["Ind_price"].HeaderText = "价格";

            this.dgv_Medicine.Columns[this.dgv_Medicine.Columns.Count - 1].AutoSizeMode =               

                DataGridViewAutoSizeColumnMode.Fill;

            this.dgv_SelectMedicine.Columns.Clear();                                                                    this.dgv_SelectMedicine.DataSource = this.SelectMedicineTable;     this.dgv_SelectMedicine.Columns["Kind_no"].HeaderText = "编号";                     

            this.dgv_SelectMedicine.Columns["Drug_name"].HeaderText = "名称";

            this.dgv_SelectMedicine.Columns["Ind_price"].HeaderText = "价格";

            this.dgv_SelectMedicine.Columns["OrderMedicine"].HeaderText = "使用药品";

            this.dgv_SelectMedicine.Columns[this.dgv_SelectMedicine.Columns.Count - 1].AutoSizeMode =

                DataGridViewAutoSizeColumnMode.Fill;

            this.lbl_CreditSum.Text =                                                                      

                "共" + this.SelectMedicineTable.Compute("SUM(Ind_price)", "").ToString() + "元";       

 

        }

 

        private void btn_Submit_Click(object sender, EventArgs e)

        {

            SqlConnection sqlConnection = new SqlConnection();                                             

            sqlConnection.ConnectionString =

                "Server=(local);Database=Edubase2018;Integrated Security=sspi";     

            SqlCommand insertCommand = new SqlCommand();                                                                insertCommand.Connection = sqlConnection;                                                      

            insertCommand.CommandText =

                "INSERT tb_SelectMedicine(AdmissionNo,Kind_no,OrderMedicine)"

                + "VALUES(@AdmissionNo,@Kind_no,@OrderMedicine);";                                              

            insertCommand.Parameters.AddWithValue("AdmissionNo", this.txb_no.Text.Trim());

 

            insertCommand.Parameters.Add("@Kind_no", SqlDbType.Char, 10, "Kind_no");

          

            insertCommand.Parameters.Add("@OrderMedicine", SqlDbType.Bit, 0, "OrderMedicine");

            SqlCommand updateCommand = new SqlCommand();                                                   

            updateCommand.Connection = sqlConnection;                                                       

            updateCommand.CommandText =                                                                    

                "UPDATE tb_SelectMedicine"

                    + " SET OrderMedicine=@OrderMedicine"

                    + " WHERE AdmissionNo=@AdmissionNo AND Kind_no=@Kind_no;";

            updateCommand.Parameters.AddWithValue("@AdmissionNo", this.txb_no.Text.Trim());

      updateCommand.Parameters.Add("@Kind_no", SqlDbType.Char, 10, "Kind_no");

           

            updateCommand.Parameters.Add("@OrderMedicine", SqlDbType.Bit, 0, "OrderMedicine");

            SqlDataAdapter sqlDataAdapter = new SqlDataAdapter();                                          

            sqlDataAdapter.InsertCommand = insertCommand;                                                  

            sqlDataAdapter.UpdateCommand = updateCommand;                                                               sqlConnection.Open();                                                                          

            int rowAffected = sqlDataAdapter.Update(this.SelectMedicineTable);                             

            sqlConnection.Close();                                                                         

            MessageBox.Show("插入" + rowAffected.ToString() + "行。");

        }

 

        private void btn_Add_Click(object sender, EventArgs e)

        {

            if (this.dgv_Medicine.RowCount > 0)                                                              

            {

                DataRow                                                                                    

                    currentMedicineRow = ((DataRowView)this.dgv_Medicine.CurrentRow.DataBoundItem).Row         

                    , SelectMedicineRow = this.SelectMedicineTable.NewRow();                               

                SelectMedicineRow["Kind_no"] = currentMedicineRow["Kind_no"];                                           ；

                SelectMedicineRow["Drug_name"] = currentMedicineRow["Drug_name"];

                SelectMedicineRow["Ind_price"] = currentMedicineRow["Ind_price"];

                this.SelectMedicineTable.Rows.Add(SelectMedicineRow);                                      

                currentMedicineRow.Delete();                                                                 

                this.lbl_CreditSum.Text =                                                                  

                    "共" + this.SelectMedicineTable.Compute("SUM(Ind_price)", "").ToString() + "元";     

            }

        }

 

        private void btn_Remove_Click(object sender, EventArgs e)

        {

 

            if (this.dgv_SelectMedicine.RowCount > 0)                                                      

            {

                DataRow selectMedicineRow =                                                                

                    ((DataRowView)this.dgv_SelectMedicine.CurrentRow.DataBoundItem).Row;              

                if (selectMedicineRow.RowState == DataRowState.Added)                                                      {

                    string MedicineNo = selectMedicineRow["Kind_no"].ToString();                                  

                    DataRow deletedMedicineRow =                                                              

                        this.MedicineTable.Select("Kind_no'" + MedicineNo + "'", "", DataViewRowState.Deleted)[0];

                    deletedMedicineRow.RejectChanges();                                                      

                    this.SelectMedicineTable.Rows.Remove(selectMedicineRow);                                

                    this.lbl_CreditSum.Text =                                                              

                        "共" + this.SelectMedicineTable.Compute("SUM(Ind_price)", "").ToString() + "价格";   

                }

            }

        }

四、效果截图