SqlParameterCollection.Add 方法

定义

SqlParameter 中添加一个 SqlParameterCollection

重载

Add(SqlParameter)

将指定的 SqlParameter 对象添加到 SqlParameterCollection 中。

Add(Object)

将指定的 SqlParameter 对象添加到 SqlParameterCollection 中。

Add(String, SqlDbType)

在给定参数名称和数据类型时向 SqlParameter 中添加一个 SqlParameterCollection

Add(String, Object)
已过时.

将指定的 SqlParameter 对象添加到 SqlParameterCollection 中。

Add(String, SqlDbType, Int32)

SqlParameter 添加到 SqlParameterCollection 中(给定了指定的参数名、SqlDbType 和大小)。

Add(String, SqlDbType, Int32, String)

使用给定的参数名称、数据类型和列长度向 SqlParameter 中添加一个 SqlParameterCollection

Add(SqlParameter)

将指定的 SqlParameter 对象添加到 SqlParameterCollection 中。

public:
 System::Data::SqlClient::SqlParameter ^ Add(System::Data::SqlClient::SqlParameter ^ value);
public System.Data.SqlClient.SqlParameter Add (System.Data.SqlClient.SqlParameter value);
override this.Add : System.Data.SqlClient.SqlParameter -> System.Data.SqlClient.SqlParameter
member this.Add : System.Data.SqlClient.SqlParameter -> System.Data.SqlClient.SqlParameter
Public Function Add (value As SqlParameter) As SqlParameter

参数

value
SqlParameter

要添加到集合中的 SqlParameter

返回

一个新 SqlParameter 对象。

例外

value 参数中指定的 SqlParameter 已经添加到这个或其他 SqlParameterCollection 中。

传递的参数不是 SqlParameter

value 参数为 null。

示例

public void AddSqlParameter(SqlCommand command)
{
    command.Parameters.Add(new SqlParameter("Description", "Beverages"));
}
Public Sub AddSqlParameter(command As SqlCommand) 
  command.Parameters.Add(New SqlParameter("Description", "Beverages"))
End Sub

另请参阅

适用于

Add(Object)

将指定的 SqlParameter 对象添加到 SqlParameterCollection 中。

public:
 override int Add(System::Object ^ value);
public:
 virtual int Add(System::Object ^ value);
public override int Add (object value);
public int Add (object value);
override this.Add : obj -> int
abstract member Add : obj -> int
override this.Add : obj -> int
Public Overrides Function Add (value As Object) As Integer
Public Function Add (value As Object) As Integer

参数

value
Object

Object

返回

新的 SqlParameter 对象的索引。

实现

示例

下面的示例演示 IList 接口的实现以创建具有固定大小的简单列表。 此代码是 接口的更大示例的 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

注解

此成员是显式接口成员的实现。 它只能在 SqlParameterCollection 实例被强制转换为 IList 接口时使用。

另请参阅

适用于

Add(String, SqlDbType)

在给定参数名称和数据类型时向 SqlParameter 中添加一个 SqlParameterCollection

public:
 System::Data::SqlClient::SqlParameter ^ Add(System::String ^ parameterName, System::Data::SqlDbType sqlDbType);
public System.Data.SqlClient.SqlParameter Add (string parameterName, System.Data.SqlDbType sqlDbType);
override this.Add : string * System.Data.SqlDbType -> System.Data.SqlClient.SqlParameter
member this.Add : string * System.Data.SqlDbType -> System.Data.SqlClient.SqlParameter
Public Function Add (parameterName As String, sqlDbType As SqlDbType) As SqlParameter

参数

parameterName
String

参数的名称。

sqlDbType
SqlDbType

SqlDbType 值之一。

返回

一个新 SqlParameter 对象。

示例

public void AddSqlParameter(SqlCommand command)
{
    SqlParameter param = command.Parameters.Add(
        "@Description", SqlDbType.NVarChar);
    param.Size = 16;
    param.Value = "Beverages";
}
Public Sub AddSqlParameter(command As SqlCommand) 
  Dim param As SqlParameter = command.Parameters.Add( _
      "@Description", SqlDbType.NVarChar)
  param.Size = 16
  param.Value = "Beverages"
End Sub

另请参阅

适用于

Add(String, Object)

注意

Add(String parameterName, Object value) has been deprecated. Use AddWithValue(String parameterName, Object value). http://go.microsoft.com/fwlink/?linkid=14202

将指定的 SqlParameter 对象添加到 SqlParameterCollection 中。

public:
 System::Data::SqlClient::SqlParameter ^ Add(System::String ^ parameterName, System::Object ^ value);
public System.Data.SqlClient.SqlParameter Add (string parameterName, object value);
[System.Obsolete("Add(String parameterName, Object value) has been deprecated.  Use AddWithValue(String parameterName, Object value).  http://go.microsoft.com/fwlink/?linkid=14202", false)]
public System.Data.SqlClient.SqlParameter Add (string parameterName, object value);
member this.Add : string * obj -> System.Data.SqlClient.SqlParameter
[<System.Obsolete("Add(String parameterName, Object value) has been deprecated.  Use AddWithValue(String parameterName, Object value).  http://go.microsoft.com/fwlink/?linkid=14202", false)>]
override this.Add : string * obj -> System.Data.SqlClient.SqlParameter
Public Function Add (parameterName As String, value As Object) As SqlParameter

参数

parameterName
String

要添加到集合的 SqlParameter 的名称。

value
Object

Object

返回

一个新 SqlParameter 对象。

使用 SqlParameterCollection.Add 方法的重载来指定整数参数值时,请务必谨慎。 因为此重载接受 Object 类型的 value,所以当此值为零时,必须将整数值转换为 Object 类型,如下面的 C# 示例所示。

parameters.Add("@pname", Convert.ToInt32(0));

如果不执行此转换,编译器将假定您正尝试调用 SqlParameterCollection.Add (stringSqlDbType) 重载。

属性

例外

value 参数中指定的 SqlParameter 已经添加到这个或其他 SqlParameterCollection 中。

value 参数为 null。

示例

public void AddSqlParameter(SqlCommand command)
{
    SqlParameter param = new SqlParameter(
        "@Description", SqlDbType.NVarChar, 16);
    param.Value = "Beverages";
    command.Parameters.Add(param);
}
Public Sub AddSqlParameter(command As SqlCommand) 
  Dim param As New SqlParameter( _
      "@Description", SqlDbType.NVarChar, 16)
  param.Value = "Beverages"
  command.Parameters.Add(param)
End Sub

另请参阅

适用于

Add(String, SqlDbType, Int32)

SqlParameter 添加到 SqlParameterCollection 中(给定了指定的参数名、SqlDbType 和大小)。

public:
 System::Data::SqlClient::SqlParameter ^ Add(System::String ^ parameterName, System::Data::SqlDbType sqlDbType, int size);
public System.Data.SqlClient.SqlParameter Add (string parameterName, System.Data.SqlDbType sqlDbType, int size);
override this.Add : string * System.Data.SqlDbType * int -> System.Data.SqlClient.SqlParameter
member this.Add : string * System.Data.SqlDbType * int -> System.Data.SqlClient.SqlParameter
Public Function Add (parameterName As String, sqlDbType As SqlDbType, size As Integer) As SqlParameter

参数

parameterName
String

参数的名称。

sqlDbType
SqlDbType

要添加到集合中的 SqlParameterSqlDbType

size
Int32

Int32 的大小。

返回

一个新 SqlParameter 对象。

示例

public void AddSqlParameter(SqlCommand command)
{
    SqlParameter param = new SqlParameter(
        "@Description", SqlDbType.NVarChar, 16);
    param.Value = "Beverages";
    command.Parameters.Add(param);
}
Public Sub AddSqlParameter(command As SqlCommand) 
  Dim param As New SqlParameter( _
      "@Description", SqlDbType.NVarChar, 16)
  param.Value = "Beverages"
  command.Parameters.Add(param)
End Sub

注解

添加长度可变数据类型的参数(如 varcharbinary)时,此重载非常有用。

另请参阅

适用于

Add(String, SqlDbType, Int32, String)

使用给定的参数名称、数据类型和列长度向 SqlParameter 中添加一个 SqlParameterCollection

public:
 System::Data::SqlClient::SqlParameter ^ Add(System::String ^ parameterName, System::Data::SqlDbType sqlDbType, int size, System::String ^ sourceColumn);
public System.Data.SqlClient.SqlParameter Add (string parameterName, System.Data.SqlDbType sqlDbType, int size, string sourceColumn);
member this.Add : string * System.Data.SqlDbType * int * string -> System.Data.SqlClient.SqlParameter
override this.Add : string * System.Data.SqlDbType * int * string -> System.Data.SqlClient.SqlParameter
Public Function Add (parameterName As String, sqlDbType As SqlDbType, size As Integer, sourceColumn As String) As SqlParameter

参数

parameterName
String

参数的名称。

sqlDbType
SqlDbType

SqlDbType 值之一。

size
Int32

列的长度。

sourceColumn
String

源列名 (SourceColumn)(如果在调用 Update 中使用了此 SqlParameter)。

返回

一个新 SqlParameter 对象。

示例

public void AddSqlParameter(SqlCommand cmd)
{
  SqlParameter p1 = cmd.Parameters.Add("@Description", SqlDbType.NVarChar, 16, "Description");
}
Public Sub AddSqlParameter(cmd As SqlCommand) 
  Dim p1 As SqlParameter = cmd.Parameters.Add("@Description", SqlDbType.NVarChar, 16, "Description")
End Sub

另请参阅

适用于