ConstraintCollection.IndexOf 方法

定义

命名空间:
System.Data
程序集:
netstandard.dll, System.Data.Common.dll
程序集:
System.Data.Common.dll
程序集:
System.Data.dll
程序集:
netstandard.dll

获取指定 Constraint项的索引。

重载

名称 说明
IndexOf(Constraint)

获取指定 Constraint项的索引。
IndexOf(String)

获取按名称指定的索引 Constraint 。

IndexOf(Constraint)

Source:
ConstraintCollection.cs
Source:
ConstraintCollection.cs
Source:
ConstraintCollection.cs
Source:
ConstraintCollection.cs
Source:
ConstraintCollection.cs

获取指定 Constraint项的索引。

public:
 int IndexOf(System::Data::Constraint ^ constraint);
public int IndexOf(System.Data.Constraint? constraint);
public int IndexOf(System.Data.Constraint constraint);
member this.IndexOf : System.Data.Constraint -> int
Public Function IndexOf (constraint As Constraint) As Integer

参数

constraint
Constraint

要 Constraint 搜索的。

返回

Int32

如果位于集合中，则为从零开始的 Constraint 索引;否则为 -1。

示例

下面的示例使用 IndexOf 该方法返回 a Constraint. 在删除索引之前，该索引将 Contains 传递给该方法，以确定集合是否包含约束。

private void RemoveConstraint(
    ConstraintCollection constraints, Constraint constraint)
{
    try
    {
        if(constraints.Contains(constraint.ConstraintName))
        {
            if(constraints.CanRemove(constraint))
            {
                constraints.RemoveAt(constraints.IndexOf(constraint));
            }
        }
    }
    catch(Exception e)
    {
        // Process exception and return.
        Console.WriteLine("Exception of type {0} occurred.",
            e.GetType());
    }
}

Private Sub RemoveConstraint _
    (constraints As ConstraintCollection, constraint As Constraint)
    Try
        If constraints.Contains(constraint.ConstraintName) Then
            If constraints.CanRemove(constraint) Then
                constraints.RemoveAt _
                (constraints.IndexOf(constraint))
            End If
        End If

    Catch e As Exception
    ' Process exception and return.
        Console.WriteLine("Exception of type {0} occurred.", _
            e.GetType().ToString())
    End Try
End Sub

注解

IndexOf使用该方法返回要与或Contains方法一起使用的Remove索引。

另请参阅

适用于

IndexOf(String)

Source:
ConstraintCollection.cs
Source:
ConstraintCollection.cs
Source:
ConstraintCollection.cs
Source:
ConstraintCollection.cs
Source:
ConstraintCollection.cs

获取按名称指定的索引 Constraint 。

public:
 int IndexOf(System::String ^ constraintName);
public:
 virtual int IndexOf(System::String ^ constraintName);
public int IndexOf(string? constraintName);
public int IndexOf(string constraintName);
public virtual int IndexOf(string constraintName);
member this.IndexOf : string -> int
abstract member IndexOf : string -> int
override this.IndexOf : string -> int
Public Function IndexOf (constraintName As String) As Integer
Public Overridable Function IndexOf (constraintName As String) As Integer

参数

constraintName
String

Constraint的名称。

返回

Int32

如果该索引 Constraint 位于集合中，则为 -1。

示例

下面的示例使用 IndexOf 该方法返回 a Constraint. 索引将 Contains 传递给方法，以确定集合是否包含约束，然后再将其删除。

private void RemoveConstraint(
    ConstraintCollection constraints, Constraint constraint)
{
    try
    {
        if(constraints.Contains(constraint.ConstraintName))
        {
            if(constraints.CanRemove(constraint))
            {
                constraints.RemoveAt(
                    constraints.IndexOf(constraint.ConstraintName));
            }
        }
    }
    catch(Exception e)
    {
        // Process exception and return.
        Console.WriteLine("Exception of type {0} occurred.",
            e.GetType());
    }
}

Private Sub RemoveConstraint _
    (constraints As ConstraintCollection, constraint As Constraint)

    Try
        If constraints.Contains(constraint.ConstraintName) Then
            If constraints.CanRemove(constraint) Then
                constraints.RemoveAt _
                (constraints.IndexOf(constraint.ConstraintName))
            End If
        End If

    Catch ex As Exception
    ' Process exception and return.
        Console.WriteLine(ex.Message)
    End Try
End Sub

注解

IndexOf使用该方法返回要与或Contains方法一起使用的Remove索引。

另请参阅

适用于