筛选或检查datagridview

Question

在保存数据之前，我需要帮助来筛选或检查一个或多个datagridview单元是否为空。我尝试了几个代码，但总是有错误。下面是图片：

Answer 1

我真的不知道你正在尝试做的。也许你想要某种自动完成的过程来运行。是吗？请参阅下面的代码示例。

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

Namespace WindowsFormsApplication4 

    Public Class Form1 
     Inherits Form 

     Public Sub New() 
      MyBase.New 
      InitializeComponent 
      Me.initializeFields 
      Me.loadCustomerFromNorthwindDbToDgv1 
     End Sub 

     Private CustomerId As DataGridViewTextBoxColumn 

     Private CompanyName As DataGridViewTextBoxColumn 

     Private Address As DataGridViewTextBoxColumn 

     Private Sub initializeFields() 
      Me.CustomerId = New DataGridViewTextBoxColumn 
      Me.CustomerId.Name = "CustomerID" 
      Me.CustomerId.DataPropertyName = "CustomerID" 
      Me.dataGridView1.Columns.Add(Me.CustomerId) 
      Me.CompanyName = New DataGridViewTextBoxColumn 
      Me.CompanyName.Name = "CompanyName" 
      Me.CompanyName.DataPropertyName = "CompanyName" 
      Me.dataGridView1.Columns.Add(Me.CompanyName) 
      Me.Address = New DataGridViewTextBoxColumn 
      Me.Address.Name = "Address" 
      Me.Address.DataPropertyName = "Address" 
      Me.dataGridView1.Columns.Add(Me.Address) 
     End Sub 

     Private dv As DataView 

     Private Sub loadCustomerFromNorthwindDbToDgv1() 
      Dim conConnect As SqlConnection = New SqlConnection("Data Source = EXCEL-PC; Database = 'Northwind.MDF'; Integrated Security = true") 
      Try 
       Dim dAdapter As SqlDataAdapter = New SqlDataAdapter("SELECT CustomerID, CompanyName, Address FROM Customers ", conConnect) 
       Dim DS As DataSet = New DataSet 
       Dim bs As BindingSource = New BindingSource 
       dAdapter.Fill(DS, "dsCustomer") 
       Me.dataGridView1.AutoGenerateColumns = false 
       Dim dt As DataTable = DS.Tables("dsCustomer") 
       bs.DataSource = DS.Tables("dsCustomer") 
       Me.dv = New DataView(DS.Tables("dsCustomer")) 
       Me.dataGridView1.DataSource = bs 
      Catch ex As Exception 
       MessageBox.Show(ex.ToString) 
      End Try 

     End Sub 

     'will do the search for CompanyName name everytime you type in @ the textbox search 
     Private Sub textBox1_TextChanged(ByVal sender As Object, ByVal e As EventArgs) 
      Me.dv.RowFilter = ("CompanyName like '%' + '" _ 
         + (textBox1.Text + "' + '%' ")) 
      Me.dataGridView1.DataSource = Me.dv 
     End Sub 

     Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs) 
      ' TODO: This line of code loads data into the 'northwindDataSet.Customers' table. You can move, or remove it, as needed. 
      Me.customersTableAdapter.Fill(Me.northwindDataSet.Customers) 
     End Sub 
    End Class 
End Namespace