DataGridViewCheckBoxCell.TrueValue Özellik
Tanım
Önemli
Bazı bilgiler ürünün ön sürümüyle ilgilidir ve sürüm öncesinde önemli değişiklikler yapılmış olabilir. Burada verilen bilgilerle ilgili olarak Microsoft açık veya zımni hiçbir garanti vermez.
bir hücre true
değerine karşılık gelen temel değeri alır veya ayarlar.
public:
property System::Object ^ TrueValue { System::Object ^ get(); void set(System::Object ^ value); };
public object TrueValue { get; set; }
member this.TrueValue : obj with get, set
Public Property TrueValue As Object
Özellik Değeri
hücre Object değerine true
karşılık gelen. Varsayılan değer: null
.
Örnekler
Aşağıdaki kod örneği, ofis aydınlatmasının durumunu izlemek için bir DataGridViewCheckBoxCell kullanır. FalseValue özelliği "turnedOff" öğesini ile false
ilişkilendirir, TrueValue özelliği "turnedOn" öğesini ile true
IndeterminateValue ve özelliği belirsiz "bilinmeyen" ile ilişkilendirir.
#using <System.Windows.Forms.dll>
#using <System.dll>
#using <System.Drawing.dll>
using namespace System;
using namespace System::IO;
using namespace System::Collections::Generic;
using namespace System::Windows::Forms;
public enum class LightStatus
{
Unknown,
TurnedOn,
TurnedOff
};
public ref class TriValueVirtualCheckBox: public Form
{
private:
DataGridView^ dataGridView1;
private:
const int initialSize;
private:
Dictionary<int, LightStatus>^ store;
public:
TriValueVirtualCheckBox() : Form(), initialSize(500)
{
dataGridView1 = gcnew DataGridView();
store = gcnew Dictionary<int, LightStatus>();
Text = this->GetType()->Name;
for(int i = 0; i < initialSize; i++)
{
store->Add(i, LightStatus::Unknown);
}
Controls->Add(dataGridView1);
dataGridView1->VirtualMode = true;
dataGridView1->AllowUserToDeleteRows = false;
dataGridView1->CellValueNeeded +=
gcnew DataGridViewCellValueEventHandler(
this, &TriValueVirtualCheckBox::dataGridView1_CellValueNeeded);
dataGridView1->CellValuePushed +=
gcnew DataGridViewCellValueEventHandler(
this, &TriValueVirtualCheckBox::dataGridView1_CellValuePushed);
dataGridView1->Columns->Add(CreateCheckBoxColumn());
dataGridView1->Rows->AddCopies(0, initialSize);
}
private:
DataGridViewCheckBoxColumn^ CreateCheckBoxColumn()
{
DataGridViewCheckBoxColumn^ dataGridViewCheckBoxColumn1
= gcnew DataGridViewCheckBoxColumn();
dataGridViewCheckBoxColumn1->HeaderText = "Lights On";
dataGridViewCheckBoxColumn1->TrueValue = LightStatus::TurnedOn;
dataGridViewCheckBoxColumn1->FalseValue =
LightStatus::TurnedOff;
dataGridViewCheckBoxColumn1->IndeterminateValue
= LightStatus::Unknown;
dataGridViewCheckBoxColumn1->ThreeState = true;
dataGridViewCheckBoxColumn1->ValueType = LightStatus::typeid;
return dataGridViewCheckBoxColumn1;
}
#pragma region "data store maintance"
private:
void dataGridView1_CellValueNeeded(Object^ sender,
DataGridViewCellValueEventArgs^ e)
{
e->Value = store[e->RowIndex];
}
private:
void dataGridView1_CellValuePushed(Object^ sender,
DataGridViewCellValueEventArgs^ e)
{
store[e->RowIndex] = (LightStatus) e->Value;
}
#pragma endregion
};
[STAThread]
int main()
{
Application::Run(gcnew TriValueVirtualCheckBox());
}
using System;
using System.IO;
using System.Collections.Generic;
using System.Windows.Forms;
public class TriValueVirtualCheckBox:Form
{
DataGridView dataGridView1 = new DataGridView();
const int initialSize = 500;
Dictionary<int, LightStatus> store
= new Dictionary<int, LightStatus>();
public TriValueVirtualCheckBox() : base()
{
Text = this.GetType().Name;
int index = 0;
for(index=0; index<=initialSize; index++)
store.Add(index, LightStatus.Unknown);
Controls.Add(dataGridView1);
dataGridView1.VirtualMode = true;
dataGridView1.AllowUserToDeleteRows = false;
dataGridView1.CellValueNeeded += new
DataGridViewCellValueEventHandler(dataGridView1_CellValueNeeded);
dataGridView1.CellValuePushed += new
DataGridViewCellValueEventHandler(dataGridView1_CellValuePushed);
dataGridView1.Columns.Add(CreateCheckBoxColumn());
dataGridView1.Rows.AddCopies(0, initialSize);
}
private DataGridViewCheckBoxColumn CreateCheckBoxColumn()
{
DataGridViewCheckBoxColumn dataGridViewCheckBoxColumn1
= new DataGridViewCheckBoxColumn();
dataGridViewCheckBoxColumn1.HeaderText = "Lights On";
dataGridViewCheckBoxColumn1.TrueValue = LightStatus.TurnedOn;
dataGridViewCheckBoxColumn1.FalseValue = LightStatus.TurnedOff;
dataGridViewCheckBoxColumn1.IndeterminateValue
= LightStatus.Unknown;
dataGridViewCheckBoxColumn1.ThreeState = true;
dataGridViewCheckBoxColumn1.ValueType = typeof(LightStatus);
return dataGridViewCheckBoxColumn1;
}
#region "data store maintance"
private void dataGridView1_CellValueNeeded(object sender,
DataGridViewCellValueEventArgs e)
{
e.Value = store[e.RowIndex];
}
private void dataGridView1_CellValuePushed(object sender,
DataGridViewCellValueEventArgs e)
{
store[e.RowIndex] = (LightStatus) e.Value;
}
#endregion
[STAThreadAttribute()]
public static void Main()
{
Application.Run(new TriValueVirtualCheckBox());
}
}
public enum LightStatus
{
Unknown,
TurnedOn,
TurnedOff
};
Imports System.IO
Imports System.Collections.Generic
Imports System.Windows.Forms
Public Class TriValueVirtualCheckBox
Inherits System.Windows.Forms.Form
Dim WithEvents dataGridView1 As New DataGridView
Const initialSize As Integer = 500
Dim store As New Dictionary(Of Integer, LightStatus)
Public Sub New()
MyBase.New()
Text = Me.GetType().Name
Dim index As Integer = 0
For index = 0 To initialSize
store.Add(index, LightStatus.Unknown)
Next
Controls.Add(dataGridView1)
dataGridView1.VirtualMode = True
dataGridView1.AllowUserToDeleteRows = False
dataGridView1.Columns.Add(CreateCheckBoxColumn())
dataGridView1.Rows.AddCopies(0, initialSize)
End Sub
Private Function CreateCheckBoxColumn() As DataGridViewCheckBoxColumn
Dim dataGridViewCheckBoxColumn1 _
As New DataGridViewCheckBoxColumn()
dataGridViewCheckBoxColumn1.HeaderText = "Lights On"
dataGridViewCheckBoxColumn1.TrueValue = LightStatus.TurnedOn
dataGridViewCheckBoxColumn1.FalseValue = LightStatus.TurnedOff
dataGridViewCheckBoxColumn1.IndeterminateValue = _
LightStatus.Unknown
dataGridViewCheckBoxColumn1.ThreeState = True
dataGridViewCheckBoxColumn1.ValueType = GetType(LightStatus)
Return dataGridViewCheckBoxColumn1
End Function
#Region "data store maintance"
Private Sub dataGridView1_CellValueNeeded(ByVal sender As Object, _
ByVal e As DataGridViewCellValueEventArgs) _
Handles dataGridView1.CellValueNeeded
e.Value = store(e.RowIndex)
End Sub
Private Sub dataGridView1_CellValuePushed(ByVal sender As Object, _
ByVal e As DataGridViewCellValueEventArgs) _
Handles dataGridView1.CellValuePushed
store.Item(e.RowIndex) = CType(e.Value, LightStatus)
End Sub
#End Region
<STAThreadAttribute()> _
Public Shared Sub Main()
Application.Run(New TriValueVirtualCheckBox())
End Sub
End Class
Public Enum LightStatus
Unknown
TurnedOn
TurnedOff
End Enum
Açıklamalar
FalseValue, TrueValueve IndeterminateValue özellikleri, temel alınan veri kaynağında gerçekleşen bu durumların ilişkili değerlerini belirler.
Sahip olan TrueValue sütunun özelliğini ayarlamak, sütundaki her hücrenin özelliğini de ayarlar TrueValue ve sütun görünümünü yeniler. Tek tek hücreler için belirtilen değeri geçersiz kılmak için, sütun değerini ayarladıktan sonra hücre değerlerini ayarlayın.