SqlParameterCollection.Contains 方法

參考

定義

命名空間:: System.Data.SqlClient

組件:: System.Data.SqlClient.dll

組件:: System.Data.dll

套件:: System.Data.SqlClient v4.9.0

重要

部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。

判斷指定的物件是否在這個 SqlParameterCollection 中。

多載

Contains(SqlParameter)	判斷指定的 SqlParameter 是否在這個 SqlParameterCollection 中。
Contains(Object)	判斷指定的 Object 是否在這個 SqlParameterCollection 中。
Contains(String)	判斷指定的參數名稱是否在 SqlParameterCollection 中。

Contains(SqlParameter)

來源:: System.Data.SqlClient.notsupported.cs

判斷指定的 SqlParameter 是否在這個 SqlParameterCollection 中。

public:
 bool Contains(System::Data::SqlClient::SqlParameter ^ value);

public bool Contains (System.Data.SqlClient.SqlParameter value);

override this.Contains : System.Data.SqlClient.SqlParameter -> bool

Public Function Contains (value As SqlParameter) As Boolean

參數

value: SqlParameter

SqlParameter 值。

傳回

Boolean

若 SqlParameterCollection 包含該值，則為 true否則為 false。

另請參閱

命令和參數 (ADO.NET)
DataAdapter 的參數 (ADO.NET)
使用 .NET Framework Data Provider for SQL Server
ADO.NET 概觀 \(部分機器翻譯\)

適用於

Contains(Object)

來源:: System.Data.SqlClient.notsupported.cs

判斷指定的 Object 是否在這個 SqlParameterCollection 中。

public:
 override bool Contains(System::Object ^ value);

public:
 virtual bool Contains(System::Object ^ value);

public override bool Contains (object value);

public bool Contains (object value);

override this.Contains : obj -> bool

abstract member Contains : obj -> bool
override this.Contains : obj -> bool

Public Overrides Function Contains (value As Object) As Boolean

Public Function Contains (value As Object) As Boolean

參數

value: Object

Object 值。

傳回

Boolean

若 SqlParameterCollection 包含該值，則為 true否則為 false。

實作

Contains(Object)

範例

下列範例示範介面的實作 IList ，以建立簡單的固定大小清單。此程式代碼是介面較大範例的 IList 一部分。

class SimpleList : IList
{
    private object[] _contents = new object[8];
    private int _count;

    public SimpleList()
    {
        _count = 0;
    }

    // IList Members
    public int Add(object value)
    {
        if (_count < _contents.Length)
        {
            _contents[_count] = value;
            _count++;

            return (_count - 1);
        }

        return -1;
    }

    public void Clear()
    {
        _count = 0;
    }

    public bool Contains(object value)
    {
        for (int i = 0; i < Count; i++)
        {
            if (_contents[i] == value)
            {
                return true;
            }
        }
        return false;
    }

    public int IndexOf(object value)
    {
        for (int i = 0; i < Count; i++)
        {
            if (_contents[i] == value)
            {
                return i;
            }
        }
        return -1;
    }

    public void Insert(int index, object value)
    {
        if ((_count + 1 <= _contents.Length) && (index < Count) && (index >= 0))
        {
            _count++;

            for (int i = Count - 1; i > index; i--)
            {
                _contents[i] = _contents[i - 1];
            }
            _contents[index] = value;
        }
    }

    public bool IsFixedSize
    {
        get
        {
            return true;
        }
    }

    public bool IsReadOnly
    {
        get
        {
            return false;
        }
    }

    public void Remove(object value)
    {
        RemoveAt(IndexOf(value));
    }

    public void RemoveAt(int index)
    {
        if ((index >= 0) && (index < Count))
        {
            for (int i = index; i < Count - 1; i++)
            {
                _contents[i] = _contents[i + 1];
            }
            _count--;
        }
    }

    public object this[int index]
    {
        get
        {
            return _contents[index];
        }
        set
        {
            _contents[index] = value;
        }
    }

    // ICollection members.

    public void CopyTo(Array array, int index)
    {
        for (int i = 0; i < Count; i++)
        {
            array.SetValue(_contents[i], index++);
        }
    }

    public int Count
    {
        get
        {
            return _count;
        }
    }

    public bool IsSynchronized
    {
        get
        {
            return false;
        }
    }

    // Return the current instance since the underlying store is not
    // publicly available.
    public object SyncRoot
    {
        get
        {
            return this;
        }
    }

    // IEnumerable Members

    public IEnumerator GetEnumerator()
    {
        // Refer to the IEnumerator documentation for an example of
        // implementing an enumerator.
        throw new NotImplementedException("The method or operation is not implemented.");
    }

    public void PrintContents()
    {
        Console.WriteLine($"List has a capacity of {_contents.Length} and currently has {_count} elements.");
        Console.Write("List contents:");
        for (int i = 0; i < Count; i++)
        {
            Console.Write($" {_contents[i]}");
        }
        Console.WriteLine();
    }
}

Public Class SimpleList
    Implements IList

    Private _contents(7) As Object
    Private _count As Integer

    Public Sub New()

        _count = 0
    End Sub

    ' IList members.
    Public Function Add(ByVal value As Object) As Integer Implements IList.Add
        If _count < _contents.Length Then
            _contents(_count) = value
            _count += 1

            Return _count - 1
        End If

        Return -1
    End Function

    Public Sub Clear() Implements IList.Clear
        _count = 0
    End Sub

    Public Function Contains(ByVal value As Object) As Boolean Implements IList.Contains
        For i As Integer = 0 To Count - 1
            If _contents(i) = value Then Return True
        Next

        Return False
    End Function

    Public Function IndexOf(ByVal value As Object) As Integer Implements IList.IndexOf
        For i As Integer = 0 To Count - 1
            If _contents(i) = value Then Return i
        Next
        Return -1
    End Function

    Public Sub Insert(ByVal index As Integer, ByVal value As Object) Implements IList.Insert

        If _count + 1 <= _contents.Length AndAlso index < Count AndAlso index >= 0 Then
            _count += 1

            For i As Integer = Count - 1 To index Step -1
                _contents(i) = _contents(i - 1)
            Next
            _contents(index) = value
        End If
    End Sub

    Public ReadOnly Property IsFixedSize() As Boolean Implements IList.IsFixedSize
        Get
            Return True
        End Get
    End Property

    Public ReadOnly Property IsReadOnly() As Boolean Implements IList.IsReadOnly
        Get
            Return False
        End Get
    End Property

    Public Sub Remove(ByVal value As Object) Implements IList.Remove
        RemoveAt(IndexOf(value))
    End Sub

    Public Sub RemoveAt(ByVal index As Integer) Implements IList.RemoveAt

        if index >= 0 AndAlso index < Count Then
            for i As Integer = index To Count - 2
                _contents(i) = _contents(i + 1)
            Next
            _count -= 1
        End If
    End Sub

    Public Property Item(ByVal index As Integer) As Object Implements IList.Item
        Get
            Return _contents(index)
        End Get

        Set(ByVal value As Object)
            _contents(index) = value
        End Set
    End Property

    ' ICollection members.
    Public Sub CopyTo(ByVal array As Array, ByVal index As Integer) Implements ICollection.CopyTo
        For i As Integer = 0 To Count - 1
            array.SetValue(_contents(i), index)
            index += 1
        Next
    End Sub

    Public ReadOnly Property Count() As Integer Implements ICollection.Count
        Get
            Return _count
        End Get
    End Property

    Public ReadOnly Property IsSynchronized() As Boolean Implements ICollection.IsSynchronized
        Get
            Return False
        End Get
    End Property

    ' Return the current instance since the underlying store is not
    ' publicly available.
    Public ReadOnly Property SyncRoot() As Object Implements ICollection.SyncRoot
        Get
            Return Me
        End Get
    End Property

    ' IEnumerable members.
    Public Function GetEnumerator() As IEnumerator Implements IEnumerable.GetEnumerator

        ' Refer to the IEnumerator documentation for an example of
        ' implementing an enumerator.
        Throw New NotImplementedException("The method or operation is not implemented.")
    End Function

    Public Sub PrintContents()
        Console.WriteLine($"List has a capacity of {_contents.Length} and currently has {_count} elements.")
        Console.Write("List contents:")

        For i As Integer = 0 To Count - 1
            Console.Write($" {_contents(i)}")
        Next

        Console.WriteLine()
    End Sub
End Class

備註

這個成員是明確介面成員實作，只有在 SqlParameterCollection 執行個體轉換成 IList 介面時，才能使用這個成員。

從 .NET Framework 2.0 開始，這個方法會使用集合的物件 Equals 和 CompareTo 方法item來判斷專案是否存在。在舊版的 .NET Framework 中，這個判斷方式是在Equals集合中的物件上使用參數的 item 和 CompareTo 方法進行。

另請參閱

命令和參數 (ADO.NET)
DataAdapter 的參數 (ADO.NET)
使用 .NET Framework Data Provider for SQL Server
ADO.NET 概觀 \(部分機器翻譯\)

適用於

Contains(String)

來源:: System.Data.SqlClient.notsupported.cs

判斷指定的參數名稱是否在 SqlParameterCollection 中。

public:
 override bool Contains(System::String ^ value);

public:
 virtual bool Contains(System::String ^ value);

public override bool Contains (string value);

public bool Contains (string value);

override this.Contains : string -> bool

abstract member Contains : string -> bool
override this.Contains : string -> bool

Public Overrides Function Contains (value As String) As Boolean

Public Function Contains (value As String) As Boolean

參數

value: String

String 值。

傳回

Boolean

若 SqlParameterCollection 包含該值，則為 true否則為 false。

實作

Contains(String)

另請參閱

命令和參數 (ADO.NET)
DataAdapter 的參數 (ADO.NET)
使用 .NET Framework Data Provider for SQL Server
ADO.NET 概觀 \(部分機器翻譯\)

適用於

共用方式為

SqlParameterCollection.Contains 方法

定義

多載

Contains(SqlParameter)

參數

傳回

另請參閱

適用於

Contains(Object)

參數

傳回

實作

範例

備註

另請參閱

適用於

Contains(String)

參數

傳回

實作

另請參閱

適用於

其他資源