DbConnectionStringBuilder.Remove(String) Method

Reference

Definition

Namespace:: System.Data.Common

Assembly:: System.Data.Common.dll

Assemblies:: netstandard.dll, System.Data.Common.dll

Assembly:: System.Data.dll

Assembly:: netstandard.dll

Source:: DbConnectionStringBuilder.cs

Source:: DbConnectionStringBuilder.cs

Source:: DbConnectionStringBuilder.cs

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Removes the entry with the specified key from the DbConnectionStringBuilder instance.

public:
 virtual bool Remove(System::String ^ keyword);

public virtual bool Remove(string keyword);

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

Public Overridable Function Remove (keyword As String) As Boolean

Parameters

keyword: String

The key of the key/value pair to be removed from the connection string in this DbConnectionStringBuilder.

Returns

Boolean

true if the key existed within the connection string and was removed; false if the key did not exist.

Exceptions

ArgumentNullException

keyword is null (Nothing in Visual Basic)

NotSupportedException

The DbConnectionStringBuilder is read-only, or the DbConnectionStringBuilder has a fixed size.

Examples

static void Main()
{
    DbConnectionStringBuilder builder = new
        DbConnectionStringBuilder();
    builder.ConnectionString =
        @"Provider=Microsoft.Jet.OLEDB.4.0;Data
            Source=C:\Demo.mdb;" +
        "Jet OLEDB:System Database=system.mdw;";

    // Try to remove an existing item.
    TryRemove(builder, "Provider");

    // Try to remove a nonexistent item.
    TryRemove(builder, "User ID");

    // Try to remove an existing item,
    // demonstrating that the search isn't
    // case sensitive.
    TryRemove(builder, "DATA SOURCE");
    Console.ReadLine();
}

static void TryRemove(DbConnectionStringBuilder builder, string itemToRemove)
{
    if (builder.Remove(itemToRemove))
    {
        Console.WriteLine(@"Removed '{0}'", itemToRemove);
    }
    else
    {
        Console.WriteLine(@"Unable to remove '{0}'", itemToRemove);
    }
    Console.WriteLine(builder.ConnectionString);
}

Sub Main()
    Dim builder As New DbConnectionStringBuilder
    builder.ConnectionString = _
        "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\Demo.mdb;" & _
        "Jet OLEDB:System Database=system.mdw;"

    ' Try to remove an existing item.
    TryRemove(builder, "Provider")

    ' Try to remove a nonexistent item.
    TryRemove(builder, "User ID")

    ' Try to remove an existing item, 
    ' demonstrating that the search isn't 
    ' case sensitive.
    TryRemove(builder, "DATA SOURCE")
    Console.ReadLine()
End Sub

Sub TryRemove(ByVal builder As DbConnectionStringBuilder, _
    ByVal itemToRemove As String)

    If builder.Remove(itemToRemove) Then
        Console.WriteLine("Removed '{0}'", itemToRemove)
    Else
        Console.WriteLine("Unable to remove '{0}'", itemToRemove)
    End If
    Console.WriteLine(builder.ConnectionString)
End Sub

This sample displays the following output:

Removed 'Provider'
data source=C:\Demo.mdb;jet oledb:system database=system.mdw
Unable to remove 'User ID'
data source=C:\Demo.mdb;jet oledb:system database=system.mdw
Removed 'DATA SOURCE'
jet oledb:system database=system.mdw

Remarks

Because the Remove method returns a value that indicates its success, it is not required to look for the key before trying to remove the key/value pair from the DbConnectionStringBuilder instance.

Applies to

Product	Versions
.NET	Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9, 10
.NET Framework	2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard	2.0, 2.1
UWP	10.0

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