Språk

StrokeCollectionConverter.ConvertFrom Metod

Definition

Namnområde:
System.Windows
Sammansättning:
PresentationCore.dll

Konverterar det angivna objektet till en StrokeCollection.

public:
 override System::Object ^ ConvertFrom(System::ComponentModel::ITypeDescriptorContext ^ context, System::Globalization::CultureInfo ^ culture, System::Object ^ value);
public override object ConvertFrom(System.ComponentModel.ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value);
override this.ConvertFrom : System.ComponentModel.ITypeDescriptorContext * System.Globalization.CultureInfo * obj -> obj
Public Overrides Function ConvertFrom (context As ITypeDescriptorContext, culture As CultureInfo, value As Object) As Object

Parametrar

context
ITypeDescriptorContext

En ITypeDescriptorContext som ger en formatkontext.

culture
CultureInfo

Att CultureInfo använda som den aktuella kulturen.

value
Object

Att Object konvertera.

Returer

Object

En StrokeCollection konverterad från value.

Exempel

I följande exempel visas hur du konverterar en ISF-sträng (Base-64, kodat ink serialiserat format) till en StrokeCollection. Detta förutsätter att det finns ett InkPresenter som heter presenter.

// The base-64 encoded string that contains ink data 
// in ink serialized format (ISF).
string strokesString =
    @"AOoFAxBIEEVqGwIAWf9GahsCAFn/GRQyCACAEAIAAABCMwgAgA"
    + "wCAAAAQhWrqtNBq6rTQaVh0MSr+ivFHyEVVFVVVVV1OkBUVVVVVXU6QJ7"
    + "0SZ80DJrAVFVVVVV/pcAKU3yC/gEb+AX/k5Z8PwWBO5KktgJSUAAKjzyC"
    + "wBZYLEoCJLd+Cbti873JlTUvn158doCC/gKb+ApwAJslSywE2ALAAWPPI"
    + "FhKWBKWAKAmwJVglAKACiMjgv3d+8Xi+fHWM2WC0zcm89+NSoL+A5P4Dl"
    + "uNlhFIqpLKAAoaF4L+AhP4CFAWAWCggv4Dc/gNty2yy5SrlKAKIhyC/gI"
    + "b+Ai+JZc2XZOyb46vLQCC/gOL+A5YDNlWFjN3CwAKQFeC/gOr+A7VhUFZ"
    + "KCsS2WTc2SyhKuWVLR3ly2LAXx574ssUgv4Dm/gOcCwEEpUTYSixUsuWy"
    + "gVZ79AQsWGyWUAKLCiC/gQT+BA9SWbllDfGqy3Lcu+OmfH8EIL+BDv4EP"
    + "XLKSpY3lVFhZuVZvKACkFggv4F2/gXlKLFuCVKTcsqUlkoRKBmk8zfFll"
    + "S2ySlACwAgv4Ds/gO+WWWWLBLFllllSksAoSkWG1kSbFu5AoAAAo/YoL+"
    + "Biv4GJJU+P4qSalUBKWdkBYCbm+Nliyk1CVKgCxYNYqC/gQb+BBwO8ABY"
    + "olDz4gAEzaw2AVCUKAsWCooCiAegv4Hw/gfEJe8zUoSgLCC/gNT+A0xM7"
    + "Gdmdliay2VaAo0PoL+B7v4Hx5Yq3lc2xZsseeC3N8aDXjUpWW4UIL+A5P"
    + "4DnhYqAIWFkqpcrLZuJuWqSyxVAovNoL+CJP4IjnlkDvHeSbSVd9FqFlI"
    + "oWAAgv4Dk/gOVc7gbmdyZ1LajFFJmlRKsoAKVXmC/go7+CjdRvredypaK"
    + "myLC7ytZQqFiyWbikAEvfg2pSVKS7liSwWJNsrbi4CC/gQD+A/9M2ACxU"
    + "qKjcVuXKiosCWWKQSyhvKRUUWULCwEmyyu4gA=";

' The base-64 encoded string that contains ink data 
' in ink serialized format (ISF).
Private strokesString As String = _
    "AOoFAxBIEEVqGwIAWf9GahsCAFn/GRQyCACAEAIAAABCMwgAgA" _
    & "wCAAAAQhWrqtNBq6rTQaVh0MSr+ivFHyEVVFVVVVV1OkBUVVVVVXU6QJ7" _
    & "0SZ80DJrAVFVVVVV/pcAKU3yC/gEb+AX/k5Z8PwWBO5KktgJSUAAKjzyC" _
    & "wBZYLEoCJLd+Cbti873JlTUvn158doCC/gKb+ApwAJslSywE2ALAAWPPI" _
    & "FhKWBKWAKAmwJVglAKACiMjgv3d+8Xi+fHWM2WC0zcm89+NSoL+A5P4Dl" _
    & "uNlhFIqpLKAAoaF4L+AhP4CFAWAWCggv4Dc/gNty2yy5SrlKAKIhyC/gI" _
    & "b+Ai+JZc2XZOyb46vLQCC/gOL+A5YDNlWFjN3CwAKQFeC/gOr+A7VhUFZ" _
    & "KCsS2WTc2SyhKuWVLR3ly2LAXx574ssUgv4Dm/gOcCwEEpUTYSixUsuWy" _
    & "gVZ79AQsWGyWUAKLCiC/gQT+BA9SWbllDfGqy3Lcu+OmfH8EIL+BDv4EP" _
    & "XLKSpY3lVFhZuVZvKACkFggv4F2/gXlKLFuCVKTcsqUlkoRKBmk8zfFll" _
    & "S2ySlACwAgv4Ds/gO+WWWWLBLFllllSksAoSkWG1kSbFu5AoAAAo/YoL+" _
    & "Biv4GJJU+P4qSalUBKWdkBYCbm+Nliyk1CVKgCxYNYqC/gQb+BBwO8ABY" _
    & "olDz4gAEzaw2AVCUKAsWCooCiAegv4Hw/gfEJe8zUoSgLCC/gNT+A0xM7" _
    & "Gdmdliay2VaAo0PoL+B7v4Hx5Yq3lc2xZsseeC3N8aDXjUpWW4UIL+A5P" _
    & "4DnhYqAIWFkqpcrLZuJuWqSyxVAovNoL+CJP4IjnlkDvHeSbSVd9FqFlI" _
    & "oWAAgv4Dk/gOVc7gbmdyZ1LajFFJmlRKsoAKVXmC/go7+CjdRvredypaK" _
    & "myLC7ytZQqFiyWbikAEvfg2pSVKS7liSwWJNsrbi4CC/gQD+A/9M2ACxU" _
    & "qKjcVuXKiosCWWKQSyhvKRUUWULCwEmyyu4gA="

// Accepts a string that contains ink data in ink 
// serialized format (ISF) and converts it into a StrokeCollection.
public void LoadStrokes()
{
    StrokeCollectionConverter converter =
        new StrokeCollectionConverter();

    if (converter.CanConvertFrom(typeof(string)))
    {
        StrokeCollection newStrokes =
            (StrokeCollection)converter.ConvertFrom(null, null, strokesString);
        presenter.Strokes.Clear();
        presenter.Strokes.Add(newStrokes);
    }
}

' Accepts a string that contains ink data in ink 
' serialized format (ISF) and converts it into a StrokeCollection.
Public Sub LoadStrokes()

    Dim converter As New StrokeCollectionConverter()

    If converter.CanConvertFrom(GetType(String)) Then
        Dim newStrokes As StrokeCollection

        newStrokes = converter.ConvertFrom(Nothing, Nothing, strokesString)
        presenter.Strokes.Clear()
        presenter.Strokes.Add(newStrokes)

    End If

End Sub

Kommentarer

Metoden ConvertFrom returnerar null om value inte är en String.

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