无法将Gridview的更改更新为数据库

Question

编辑gridview后无法更新对数据库的更改。没有引发错误，但数据库中的表中没有更新更改。我在这里使用Sql服务器，并且我有两个名为Form1和Form 2的Winforms。一个按钮（Form1中的btnSearchAll）打开Form2中的gridview并加载所有数据。当我尝试在GridView中编辑数据（在Form2中）并尝试更新时，它不会更新这些更改。请帮助

下面是我的表1：

namespace Tailor_app 
{ 
    public partial class Form1 : Form 
    { 
     DataSet ds = new DataSet(); 
     SqlConnection con = new SqlConnection("server=(local);Database=MSNETDB;Integrated Security=true;"); 
     SqlDataAdapter da; 
     DataTable dt; 

    public Form1() 
    { 
     InitializeComponent(); 
    } 

    private void Form1_Load(object sender, EventArgs e) 
    { 
     //SqlConnection con = new SqlConnection("server=(local);Database=MSNETDB;Integrated Security=true;"); 
     txtFirstName.Focus(); 
     da = new SqlDataAdapter("select * from Measurement", con); 
     da.Fill(ds, "Measurement"); 
     dt = ds.Tables["Measurement"]; 
     SqlCommandBuilder cb = new SqlCommandBuilder(da); 
     cb.ConflictOption = ConflictOption.CompareAllSearchableValues; 
    } 

    private void btnSave_Click(object sender, EventArgs e) 
    { 
      DataRow dr = dt.NewRow(); 
      dr["CellNumber"] = txtCellNo.Text.Trim(); 
      dr["FirstName"] = txtFirstName.Text; 
      dr["LastName"] = txtLastName.Text; 
      dr["Shirt"] = txtShirt.Text; 
      dr["Pant"] = txtPant.Text; 
      dr["DueDate"] = txtDueDate.Text; 
      dr["Date"] = txtDate.Text; 
      if (dr["CellNumber"] == "") 
      { 
       MessageBox.Show("Please enter Cell Number"); 
      } 
      else if (dr["CellNumber"] != "") 
      { 
       dt.Rows.Add(dr); 
       MessageBox.Show("Success"); 
      } 

       try 
       { 
        da.Update(ds, "Measurement"); 
       } 
       catch (DBConcurrencyException ex) 
       { 
        MessageBox.Show(ex.Message); 
        dt.Clear(); 
        da.Fill(ds, "Measurement"); 
       } 
     } 

    private void btnSearchAllCustomers_Click(object sender, EventArgs e) 
    { 
     this.Hide(); 
     frmDgv_SearchResult frm2 = new frmDgv_SearchResult(); 
     frm2.Show(); 

     using (da = new SqlDataAdapter()) 
     { 
      try 
      { 
       da.SelectCommand = new SqlCommand("Select * From Measurement", con); 
       ds.Clear(); 
       da.Fill(ds,"Measurement"); 
       dt = ds.Tables["Measurement"]; 
       frm2.dgvSearchResults.DataSource = dt; 
      } 
      catch (Exception ex) 
      { 
       MessageBox.Show(ex.Message.ToString()); 
      } 
     } 
    } 
} 

}

下面是我的表2：

namespace Tailor_app 
{ 

public partial class frmDgv_SearchResult : Form 
{ 
    DataSet ds = new DataSet(); 
    SqlConnection con = new SqlConnection("server=(local);Database=MSNETDB;Integrated Security=true;"); 
    SqlDataAdapter da; 
    DataTable dt; 

    public frmDgv_SearchResult() 
    { 
     InitializeComponent(); 
    } 

    private void dgvSearchResults_CellContentClick(object sender, DataGridViewCellEventArgs e) 
    { 

    } 

     private void frmDgv_SearchResult_Load(object sender, EventArgs e) 
    { 
     da = new SqlDataAdapter("select * from Measurement", con); 
     da.Fill(ds, "Measurement"); 
     dt = ds.Tables["Measurement"]; 
     SqlCommandBuilder cb = new SqlCommandBuilder(da); 
     cb.ConflictOption = ConflictOption.CompareAllSearchableValues; 
    } 

    private void btnUpdate_Click(object sender, EventArgs e) 
    { 
     try 
      { 
       da.Update(ds, "Measurement"); 
      } 
      catch (DBConcurrencyException ex) 
      { 
       MessageBox.Show(ex.Message); 
       dt.Clear(); 
       da.Fill(ds, "Measurement"); 
      } 
      finally 
      { 
       MessageBox.Show("success"); 
      } 
     } 

Answer 1

尝试申请为自己的数据适配器更新命令你的数据表中所做的所有更改： -

private void frmDgv_SearchResult_Load(object sender, EventArgs e) 
    { 
     da = new SqlDataAdapter("select * from Measurement", con); 
     da.Fill(ds, "Measurement"); 
     dt = ds.Tables["Measurement"]; 
     SqlCommandBuilder cb = new SqlCommandBuilder(da); 

     cb.GetInsertCommand(); 
     cb.GetUpdateCommand(); 
     cb.GetDeleteCommand(); 

     cb.ConflictOption = ConflictOption.CompareAllSearchableValues; 
    } 

Answer 2

你应该dt.AcceptChanges();后插入，更新或删除。 AcceptChanges提交自上次AcceptChanges被称为

Answer 3

矿山看起来更像是这样的：

da.Fill(dt) 

Dim cb As SqlCommandBuilder = New SqlCommandBuilder(da) 

da.MissingSchemaAction = MissingSchemaAction.AddWithKey  ' includes default field value settings 
da.InsertCommand = cb.GetInsertCommand  ' instantiate for transaction 
da.UpdateCommand = cb.GetUpdateCommand