CustomStrokes.Item 属性 (String)

项目
11/04/2008

获取 CustomStrokes 集合中具有指定名称的 Strokes 集合。

命名空间： Microsoft.Ink
程序集： Microsoft.Ink（在 Microsoft.Ink.dll 中）

语法

声明
Public ReadOnly Property Item ( _
    name As String _
) As Strokes
用法
Dim instance As CustomStrokes
Dim name As String
Dim value As Strokes

value = instance.Item(name)

public Strokes Item[
    string name
] { get; }

public:
property Strokes^ Item[String^ name] {
    Strokes^ get (String^ name);
}

/** @property */
public Strokes get_Item(
    String name
)

JScript 不支持索引属性。

参数

name
类型：System.String
要从集合返回的 Strokes 集合的名称。

属性值

类型：Microsoft.Ink.Strokes
CustomStrokes 集合中的指定的 Strokes 集合。

备注

如果 name 与 CustomStrokes 集合的现有成员不匹配，则会引发 System.ArgumentException。

备注

在 C# 中，应按下例所示使用该集合的索引器，而不是使用该集合的 Item 属性。

示例

在此示例中，如果 Ink 对象的 CustomStrokes 集合包含具有指定名称的 Strokes 集合，则方法返回 true。如果没有具有指定名称的 Strokes 集合，则会引发异常，并且方法返回 false。

Private Function CustomStrokesCollectionExists(ByVal mName As String, ByVal mInk As Ink) As Boolean
    Try
        Dim S As Strokes = mInk.CustomStrokes(mName)
        ' In VB, you can also access the named collections by using the Item property:
        ' Dim S As Strokes = mInk.CustomStrokes.Item(mName)
        '
        ' if the previous statement did not raise an exception, 
        ' the named Strokes collection exists
        Return True

    Catch E As ArgumentException
        ' this exception is raised when the named collection does not exist

    Catch E As Exception
        ' in case another type of exception is raised

    End Try
    Return False
End Function

private bool CustomStrokesCollectionExists(string mName, Ink mInk)
{
    try
    {
        Strokes S = mInk.CustomStrokes[mName];
        // In C#, the Item property is not available. The following won't compile:
        // Strokes S = mInk.CustomStrokes.Item[mName];

        // if the previous statement did not throw an exception, 
        // the named Strokes collection exists
        return true;
    }
    catch (ArgumentException)
    {
        // this exception is raised when the named collection does not exist
    }
    catch (Exception)
    {
        // in case another type of exception is raised
    }
    return false;
}