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EdmFunctions.Substring Method

.NET Framework 4.5

Creates a DbFunctionExpression that invokes the canonical 'Substring' function with the specified arguments, which must have a string and integer numeric result types. The result type of the expression is string.

Namespace:  System.Data.Common.CommandTrees.ExpressionBuilder
Assembly:  System.Data.Entity (in System.Data.Entity.dll)

public static DbFunctionExpression Substring(
	this DbExpression stringArgument,
	DbExpression start,
	DbExpression length
)

Parameters

stringArgument
Type: System.Data.Common.CommandTrees.DbExpression

An expression that specifies the string from which to extract the substring.

start
Type: System.Data.Common.CommandTrees.DbExpression

An expression that specifies the starting index from which the substring should be taken.

length
Type: System.Data.Common.CommandTrees.DbExpression

An expression that specifies the length of the substring.

Return Value

Type: System.Data.Common.CommandTrees.DbFunctionExpression
A new DbFunctionExpression that returns the substring of length length from stringArgument starting at start.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type DbExpression. When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).

ExceptionCondition
ArgumentNullException

stringArgumentstartlength

ArgumentException

stringArgumentstartlength

Substring requires that the index specified by start be <b>1-based</b>.

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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