DbConnectionStringBuilder.AppendKeyValuePair Method (StringBuilder, String, String, Boolean)


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Provides an efficient and safe way to append a key and value to an existing StringBuilder object.

Namespace:   System.Data.Common
Assembly:  System.Data (in System.Data.dll)

Public Shared Sub AppendKeyValuePair (
	builder As StringBuilder,
	keyword As String,
	value As String,
	useOdbcRules As Boolean


Type: System.Text.StringBuilder

The StringBuilder to which to add the key/value pair.

Type: System.String

The key to be added.

Type: System.String

The value for the supplied key.

Type: System.Boolean

true to use {} to delimit fields, false to use quotation marks.

This method allows developers using a StringBuilder to create a collection of key/value pairs to be able to take advantage of the features included in the DbConnectionStringBuilder class when adding key/value pairs, without having to incur the overhead of creating and maintaining a DbConnectionStringBuilder instance. The AppendKeyValuePair method formats the key and value correctly and adds the new string to the supplied StringBuilder.

Although most data sources let you delimit fields by using quotation marks, ODBC does not--for ODBC connection strings, you must use curly braces ({}). In order to have the DbConnectionStringBuilder use ODBC rules for delimiting fields, set the useOdbcRules parameter to true.

If some process has created a connection string, but now an application must perform a simple modification to that connection string, it might be more efficient to just add the key/value pair using a StringBuilder object. Instead of creating a new DbConnectionStringBuilder, developers can call the AppendKeyValuePair method, passing in a StringBuilder that contains the supplied connection string. The following procedure shows a simple example of this technique, using ODBC rules for quoting values.

Public Function AddPooling(ByVal connectionString As String) As String
    Dim builder As New StringBuilder(connectionString)
    DbConnectionStringBuilder.AppendKeyValuePair(builder, "Pooling", "True")
    Return builder.ToString()
End Function

.NET Framework
Available since 2.0
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