DataGridView数据检索混淆

Question

我试图从窗体单击查看按钮后，从数据库检索数据，但每次我点击查看按钮时，DataGridView控件中的多个行复制数据库中的相同数据，而不是检索相同的数据每次点击查看按钮时从DataGridView中开始的数据。

 //For view button 
     private void button2_Click(object sender, EventArgs e) 
     { 
       BindingSource bindingSource = new BindingSource(); 
       bindingSource.DataSource = businesslayer.View("Select * from itemmaster"); //passed to business access layer class 
       dataGridView1.DataSource = bindingSource; 

     } 


//Method in DataAccessLayer class 
public DataTable View(String query) 
     { 
      //Initialize a connection object 
      OpenConn(); 

      //Initalize a command object with passing string value 
      command = new SqlCommand(query, connection); 
      SqlDataAdapter da = new SqlDataAdapter(); 
      da.SelectCommand = command; 

      //Fill dataset with a table 
      da.Fill(dataset, thisTable); 
      return dataset.Tables[thisTable]; 
     } 

谁能告诉我怎样才能解决这个问题

Answer 1

BindingSource bindingSource = new BindingSource(); 
dataGridView1.Items.Clear(); 
bindingSource.DataSource = businesslayer.View("Select * from itemmaster"); //passed to business access layer class 
dataGridView1.DataSource = bindingSource; 

尝试将它绑定到你的数据源之前清除你的GridView。