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String Constructor (Char*, Int32, Int32)


Initializes a new instance of the String class to the value indicated by a specified pointer to an array of Unicode characters, a starting character position within that array, and a length.

Namespace:   System
Assembly:  mscorlib (in mscorlib.dll)

public unsafe String(
	char* value,
	int startIndex,
	int length


Type: System.Char*

A pointer to an array of Unicode characters.

Type: System.Int32

The starting position within value.

Type: System.Int32

The number of characters within value to use.

Exception Condition

startIndex or length is less than zero, value + startIndex cause a pointer overflow, or the current process does not have read access to all the addressed characters.


value specifies an array that contains an invalid Unicode character, or value + startIndex specifies an address less than 64000.


For examples and comprehensive usage information about this and other String constructor overloads, see the String constructor summary.


requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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