ErrorProvider.DataSource 属性

定义

命名空间:

System.Windows.Forms

程序集:

System.Windows.Forms.dll

获取或设置 ErrorProvider 监视的数据源。

public:
 property System::Object ^ DataSource { System::Object ^ get(); void set(System::Object ^ value); };

[System.ComponentModel.TypeConverter("System.Windows.Forms.Design.DataSourceConverter, System.Design, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")]
public object DataSource { get; set; }

public object DataSource { get; set; }

[<System.ComponentModel.TypeConverter("System.Windows.Forms.Design.DataSourceConverter, System.Design, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")>]
member this.DataSource : obj with get, set

member this.DataSource : obj with get, set

Public Property DataSource As Object

属性值

Object

要被监视以查找错误的基于 IList 接口的数据源。 通常情况下，这是一个要被监视错误的 DataSet。

属性

TypeConverterAttribute

示例

下面的代码示例演示如何使用 ErrorProvider a DataSource 和 DataMember 指示用户的数据错误。 此代码假定你已创建并填充了包含DataSet命名的命名dataSet1``dataTable1名称DataTable。 将控件绑定到 DataSet 控件（如 DataGridView 控件）时，通过 DataRow 对象指定的错误会显示为控件中的 DataGridView 错误标志符号。

private:
   void InitializeComponent()
   {
      
      // Standard control setup.
      //....
      // You set the DataSource to a data set, and the DataMember to a table.
      errorProvider1->DataSource = dataSet1;
      errorProvider1->DataMember = dataTable1->TableName;
      errorProvider1->ContainerControl = this;
      errorProvider1->BlinkRate = 200;
      
      //...
      // Since the ErrorProvider control does not have a visible component,
      // it does not need to be added to the form. 
   }


private:
   void buttonSave_Click( Object^ /*sender*/, System::EventArgs^ /*e*/ )
   {
      
      // Checks for a bad post code.
      DataTable^ CustomersTable;
      CustomersTable = dataSet1->Tables[ "Customers" ];
      System::Collections::IEnumerator^ myEnum = (CustomersTable->Rows)->GetEnumerator();
      while ( myEnum->MoveNext() )
      {
         DataRow^ row = safe_cast<DataRow^>(myEnum->Current);
         if ( Convert::ToBoolean( row[ "PostalCodeIsNull" ] ) )
         {
            row->RowError = "The Customer details contain errors";
            row->SetColumnError( "PostalCode", "Postal Code required" );
         }
      }
   }

private void InitializeComponent()
 {
     // Standard control setup.
     //....
     // You set the DataSource to a data set, and the DataMember to a table.
     errorProvider1.DataSource = dataSet1 ;
     errorProvider1.DataMember = dataTable1.TableName ;
     errorProvider1.ContainerControl = this ;
     errorProvider1.BlinkRate = 200 ;
     //...
     // Since the ErrorProvider control does not have a visible component,
     // it does not need to be added to the form. 
 }
 
 private void buttonSave_Click(object sender, System.EventArgs e)
 {
     // Checks for a bad post code.
     DataTable CustomersTable;
     CustomersTable = dataSet1.Tables["Customers"];
     foreach (DataRow row in (CustomersTable.Rows)) 
     {
         if (Convert.ToBoolean(row["PostalCodeIsNull"])) 
         {
             row.RowError="The Customer details contain errors";
             row.SetColumnError("PostalCode", "Postal Code required");
         } 
     } 
 }

Private Sub InitializeComponent()
    ' Standard control setup.
    '....                  
    ' You set the DataSource to a data set, and the DataMember to a table.
    errorProvider1.DataSource = dataSet1
    errorProvider1.DataMember = dataTable1.TableName
    errorProvider1.ContainerControl = Me
    errorProvider1.BlinkRate = 200
End Sub
 '...
' Since the ErrorProvider control does not have a visible component,
' it does not need to be added to the form. 

Private Sub buttonSave_Click(ByVal sender As Object, ByVal e As System.EventArgs)
    ' Checks for a bad post code.
    Dim CustomersTable As DataTable
    CustomersTable = dataSet1.Tables("Customers")
    Dim row As DataRow
    For Each row In CustomersTable.Rows
        If Convert.ToBoolean(row("PostalCodeIsNull")) Then
            row.RowError = "The Customer details contain errors"
            row.SetColumnError("PostalCode", "Postal Code required")
        End If
    Next row
End Sub

注解

这是 DataSource 一个数据源，可以附加到控件，并且要监视错误。 DataSource 可以设置为实现 IList的任何集合。

为了避免在运行时发生更改时DataSource发生冲突，DataMember应使用BindToDataAndErrors而不是单独设置DataSourceDataMember。

另请参阅

• DataMember
• IList