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SqlHelperMergeColumns Method (IEnumerableString, IEnumerableString, FuncString, String, Boolean, FuncString, String)
Merges the sets of columns and makes sure that each column in the result is present only once.

Namespace: CMS.DataEngine
Assembly: CMS.DataEngine (in CMS.DataEngine.dll) Version: 8.2.23
public static string MergeColumns(
	IEnumerable<string> columns,
	IEnumerable<string> addColumns = null,
	Func<string, string> uniqueKey = null,
	bool extraColumns = true,
	Func<string, string> transformation = null


Type: System.Collections.GenericIEnumerableString
Original column list
addColumns (Optional)
Type: System.Collections.GenericIEnumerableString
List of columns to add
uniqueKey (Optional)
Type: SystemFuncString, String
Function which provides unique key for the merging process (if two column keys match, the merging process allows only first column)
extraColumns (Optional)
Type: SystemBoolean
Indicates if columns which are not part of '*' expression are merged to the existing list of columns
transformation (Optional)
Type: SystemFuncString, String
Column transformation

Return Value

Type: String
Returns the list separated by dashes for use in SQL query
See Also