SqlParameterCollection.AddWithValue(String, Object) 方法

定義

命名空間:
System.Data.SqlClient
組件:
System.Data.dll

會為 的末尾 SqlParameterCollection加上一個值。

public:
 System::Data::SqlClient::SqlParameter ^ AddWithValue(System::String ^ parameterName, System::Object ^ value);
public System.Data.SqlClient.SqlParameter AddWithValue(string parameterName, object value);
member this.AddWithValue : string * obj -> System.Data.SqlClient.SqlParameter
Public Function AddWithValue (parameterName As String, value As Object) As SqlParameter

參數

parameterName
String

參數的名稱。

value
Object

要加入的值。 用 取代 Value null 來表示 null 值。

傳回

SqlParameter

SqlParameter 物件。

範例

以下範例示範如何使用此 AddWithValue 方法。

private static void UpdateDemographics(Int32 customerID,
    string demoXml, string connectionString)
{
    // Update the demographics for a store, which is stored
    // in an xml column.
    string commandText = "UPDATE Sales.Store SET Demographics = @demographics "
        + "WHERE CustomerID = @ID;";

    using (SqlConnection connection = new SqlConnection(connectionString))
    {
        SqlCommand command = new SqlCommand(commandText, connection);
        command.Parameters.Add("@ID", SqlDbType.Int);
        command.Parameters["@ID"].Value = customerID;

        // Use AddWithValue to assign Demographics.
        // SQL Server will implicitly convert strings into XML.
        command.Parameters.AddWithValue("@demographics", demoXml);

        try
        {
            connection.Open();
            Int32 rowsAffected = command.ExecuteNonQuery();
            Console.WriteLine("RowsAffected: {0}", rowsAffected);
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.Message);
        }
    }
}

Private Sub UpdateDemographics(ByVal customerID As Integer, _
    ByVal demoXml As String, _
    ByVal connectionString As String)

    ' Update the demographics for a store, which is stored 
    ' in an xml column.
    Dim commandText As String = _
     "UPDATE Sales.Store SET Demographics = @demographics " _
     & "WHERE CustomerID = @ID;"

    Using connection As New SqlConnection(connectionString)
        Dim command As New SqlCommand(commandText, connection)

        ' Add CustomerID parameter for WHERE clause.
        command.Parameters.Add("@ID", SqlDbType.Int)
        command.Parameters("@ID").Value = customerID

        ' Use AddWithValue to assign Demographics.
        ' SQL Server will implicitly convert strings into XML.
        command.Parameters.AddWithValue("@demographics", demoXml)

        Try
            connection.Open()
            Dim rowsAffected As Integer = command.ExecuteNonQuery()
            Console.WriteLine("RowsAffected: {0}", rowsAffected)

        Catch ex As Exception
            Console.WriteLine(ex.Message)
        End Try
    End Using
End Sub

備註

AddWithValue 取代 SqlParameterCollection.Add 了取 a String 和 的 Object。 該超載Add會取一個字串和一個物件，因為可能存在SqlDbTypeSqlParameterCollection.AddString歧義，將一個與列舉值一起傳遞整數，可能被解讀為參數值或對應SqlDbType值。 只要你想新增參數，就指定 AddWithValue 名稱和值。

列 SqlDbTypeXml 舉值可以用字串、XML 值、 XmlReader 派生型別實例或 SqlXml 物件。

適用於

另請參閱