UniqueConstraint Constructores

Source:

UniqueConstraint.cs

Source:

UniqueConstraint.cs

Source:

UniqueConstraint.cs

public:
 UniqueConstraint(System::Data::DataColumn ^ column);

public UniqueConstraint (System.Data.DataColumn column);

new System.Data.UniqueConstraint : System.Data.DataColumn -> System.Data.UniqueConstraint

Public Sub New (column As DataColumn)

Parámetros

Ejemplos

En el ejemplo siguiente se crea un nuevo UniqueConstraint y se asigna a la ParentKeyConstraint propiedad de .DataRelation

Private Sub CreateUniqueConstraint(ByVal dataSetSuppliers As DataSet)
    Dim uniqueConstraint As UniqueConstraint

    ' Get the DataColumn of a table in a DataSet.
    Dim dataColumn As DataColumn
    dataColumn = dataSetSuppliers.Tables("Suppliers").Columns("SupplierID")

    ' Create the constraint.
    uniqueConstraint = New UniqueConstraint("supplierIdConstraint", dataColumn)

    ' Add the constraint to the ConstraintCollection of the DataTable.
    dataSetSuppliers.Tables("Suppliers").Constraints.Add(uniqueConstraint)
End Sub

Consulte también

• Agregar restricciones a una tabla

Source:

UniqueConstraint.cs

Source:

UniqueConstraint.cs

Source:

UniqueConstraint.cs

public:
 UniqueConstraint(cli::array <System::Data::DataColumn ^> ^ columns);

public UniqueConstraint (System.Data.DataColumn[] columns);

new System.Data.UniqueConstraint : System.Data.DataColumn[] -> System.Data.UniqueConstraint

Public Sub New (columns As DataColumn())

Parámetros

Consulte también

• Agregar restricciones a una tabla

Source:

UniqueConstraint.cs

Source:

UniqueConstraint.cs

Source:

UniqueConstraint.cs

public:
 UniqueConstraint(System::Data::DataColumn ^ column, bool isPrimaryKey);

public UniqueConstraint (System.Data.DataColumn column, bool isPrimaryKey);

new System.Data.UniqueConstraint : System.Data.DataColumn * bool -> System.Data.UniqueConstraint

Public Sub New (column As DataColumn, isPrimaryKey As Boolean)

Parámetros

Consulte también

• Agregar restricciones a una tabla

Source:

UniqueConstraint.cs

Source:

UniqueConstraint.cs

Source:

UniqueConstraint.cs

public:
 UniqueConstraint(cli::array <System::Data::DataColumn ^> ^ columns, bool isPrimaryKey);

public UniqueConstraint (System.Data.DataColumn[] columns, bool isPrimaryKey);

new System.Data.UniqueConstraint : System.Data.DataColumn[] * bool -> System.Data.UniqueConstraint

Public Sub New (columns As DataColumn(), isPrimaryKey As Boolean)

Parámetros

Consulte también

• Agregar restricciones a una tabla

Source:

UniqueConstraint.cs

Source:

UniqueConstraint.cs

Source:

UniqueConstraint.cs

public:
 UniqueConstraint(System::String ^ name, System::Data::DataColumn ^ column);

public UniqueConstraint (string? name, System.Data.DataColumn column);

public UniqueConstraint (string name, System.Data.DataColumn column);

new System.Data.UniqueConstraint : string * System.Data.DataColumn -> System.Data.UniqueConstraint

Public Sub New (name As String, column As DataColumn)

Parámetros

Ejemplos

En el ejemplo siguiente se crea un nuevo UniqueConstraint y se asigna a la ParentKeyConstraint propiedad de .DataRelation

Private Sub CreateUniqueConstraint(ByVal dataSetSuppliers As DataSet)
    Dim uniqueConstraint As UniqueConstraint

    ' Get the DataColumn of a table in a DataSet.
    Dim dataColumn As DataColumn
    dataColumn = dataSetSuppliers.Tables("Suppliers").Columns("SupplierID")

    ' Create the constraint.
    uniqueConstraint = New UniqueConstraint("supplierIdConstraint", dataColumn)

    ' Add the constraint to the ConstraintCollection of the DataTable.
    dataSetSuppliers.Tables("Suppliers").Constraints.Add(uniqueConstraint)
End Sub

Consulte también

• DataRelation
• ParentKeyConstraint
• Agregar restricciones a una tabla

Source:

UniqueConstraint.cs

Source:

UniqueConstraint.cs

Source:

UniqueConstraint.cs

public:
 UniqueConstraint(System::String ^ name, cli::array <System::Data::DataColumn ^> ^ columns);

public UniqueConstraint (string? name, System.Data.DataColumn[] columns);

public UniqueConstraint (string name, System.Data.DataColumn[] columns);

new System.Data.UniqueConstraint : string * System.Data.DataColumn[] -> System.Data.UniqueConstraint

Public Sub New (name As String, columns As DataColumn())

Parámetros

Ejemplos

En el ejemplo siguiente se crea un DataTable objeto con dos columnas y se agrega un nuevo UniqueConstraint a .ConstraintCollection

static private void MakeTableWithUniqueConstraint()
{
    // Create a DataTable with 2 DataColumns.
    DataTable dataTable = new DataTable("dataTable");
    DataColumn idColumn = new DataColumn(
        "id", System.Type.GetType("System.Int32"));
    DataColumn nameColumn = new DataColumn(
        "Name", System.Type.GetType("System.String"));
    dataTable.Columns.Add(idColumn);
    dataTable.Columns.Add(nameColumn);

    // Run procedure to create a constraint.
    AddUniqueConstraint(dataTable);

    // Add one row to the table.
    DataRow dataRow;
    dataRow = dataTable.NewRow();
    dataRow["id"] = 1;
    dataRow["Name"] = "John";
    dataTable.Rows.Add(dataRow);

    // Display the constraint name.
    Console.WriteLine(
        dataTable.Constraints[0].ConstraintName);

    // Try to add an identical row,
    // which throws an exception.
    try
    {
        dataRow = dataTable.NewRow();
        dataRow["id"] = 1;
        dataRow["Name"] = "John";
        dataTable.Rows.Add(dataRow);
    }
    catch (Exception ex)
    {
        Console.WriteLine(
            "Exception Type: {0}", ex.GetType());
        Console.WriteLine(
            "Exception Message: {0}", ex.Message);
    }
}
static private void AddUniqueConstraint(
    DataTable dataTable)
{
    // Create the DataColumn array.
    DataColumn[] dataColumns = new DataColumn[2];
    dataColumns[0] = dataTable.Columns["id"];
    dataColumns[1] = dataTable.Columns["Name"];

    // Create the constraint on both columns.
    UniqueConstraint uniqueConstraint =
        new UniqueConstraint("idNameConstraint", dataColumns);
    dataTable.Constraints.Add(uniqueConstraint);
}

Private Sub MakeTableWithUniqueConstraint()
    ' Create a DataTable with 2 DataColumns.
    Dim dataTable As New DataTable("dataTable")
    Dim idColumn As New DataColumn( _
        "ID", System.Type.GetType("System.Int32"))
    Dim nameColumn As New DataColumn( _
        "Name", System.Type.GetType("System.String"))
    dataTable.Columns.Add(idColumn)
    dataTable.Columns.Add(nameColumn)

    ' Run procedure to create a constraint.
    AddUniqueConstraint(dataTable)

    ' Add one row to the table.
    Dim dataRow As DataRow
    dataRow = dataTable.NewRow()
    dataRow("ID") = 1
    dataRow("Name") = "John"
    dataTable.Rows.Add(dataRow)

    ' Display the constraint name.
    Console.WriteLine(dataTable.Constraints(0).ConstraintName)

    ' Try to add an identical row,
    ' which throws an exception.
    Try
        dataRow = dataTable.NewRow()
        dataRow("ID") = 1
        dataRow("Name") = "John"
        dataTable.Rows.Add(dataRow)
    Catch ex As Exception
        Console.WriteLine("Exception Type: {0}", ex.GetType())
        Console.WriteLine("Exception Message: {0}", ex.Message)
    End Try
End Sub

Private Sub AddUniqueConstraint(ByVal dataTable As DataTable)
    ' Create the DataColumn array.
    Dim dataColumns(1) As DataColumn
    dataColumns(0) = dataTable.Columns("ID")
    dataColumns(1) = dataTable.Columns("Name")

    ' Create the constraint on both columns.
    Dim uniqueConstraint As UniqueConstraint = _
        New UniqueConstraint("idNameConstraint", dataColumns)
    dataTable.Constraints.Add(uniqueConstraint)
End Sub

Consulte también

• Agregar restricciones a una tabla

Source:

UniqueConstraint.cs

Source:

UniqueConstraint.cs

Source:

UniqueConstraint.cs

public:
 UniqueConstraint(System::String ^ name, System::Data::DataColumn ^ column, bool isPrimaryKey);

public UniqueConstraint (string? name, System.Data.DataColumn column, bool isPrimaryKey);

public UniqueConstraint (string name, System.Data.DataColumn column, bool isPrimaryKey);

new System.Data.UniqueConstraint : string * System.Data.DataColumn * bool -> System.Data.UniqueConstraint

Public Sub New (name As String, column As DataColumn, isPrimaryKey As Boolean)

Parámetros

Consulte también

• Agregar restricciones a una tabla

Source:

UniqueConstraint.cs

Source:

UniqueConstraint.cs

Source:

UniqueConstraint.cs

public:
 UniqueConstraint(System::String ^ name, cli::array <System::Data::DataColumn ^> ^ columns, bool isPrimaryKey);

public UniqueConstraint (string? name, System.Data.DataColumn[] columns, bool isPrimaryKey);

public UniqueConstraint (string name, System.Data.DataColumn[] columns, bool isPrimaryKey);

new System.Data.UniqueConstraint : string * System.Data.DataColumn[] * bool -> System.Data.UniqueConstraint

Public Sub New (name As String, columns As DataColumn(), isPrimaryKey As Boolean)

Parámetros

Consulte también

• Agregar restricciones a una tabla

Source:

UniqueConstraint.cs

Source:

UniqueConstraint.cs

Source:

UniqueConstraint.cs

public:
 UniqueConstraint(System::String ^ name, cli::array <System::String ^> ^ columnNames, bool isPrimaryKey);

[System.ComponentModel.Browsable(false)]
public UniqueConstraint (string? name, string[]? columnNames, bool isPrimaryKey);

[System.ComponentModel.Browsable(false)]
public UniqueConstraint (string name, string[] columnNames, bool isPrimaryKey);

[<System.ComponentModel.Browsable(false)>]
new System.Data.UniqueConstraint : string * string[] * bool -> System.Data.UniqueConstraint

Public Sub New (name As String, columnNames As String(), isPrimaryKey As Boolean)

Parámetros

Atributos

BrowsableAttribute

Comentarios

Este constructor se proporciona para la compatibilidad con tiempo de diseño en el entorno de Visual Studio .NET. Los objetos UniqueConstraint que se creen utilizando este constructor deben agregarse a la colección mediante AddRange. Las columnas con los nombres especificados deben existir en el momento en que se llama al método o si BeginInit se ha llamado antes de llamar a este constructor, las columnas con los nombres especificados deben existir en el momento en que EndInit se llama a .

Consulte también

• Agregar restricciones a una tabla