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String.StartsWith Method (String)

Determines whether the beginning of this string instance matches the specified string.

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

member StartsWith : 
        value:string -> bool

Parameters

value
Type: System.String

The string to compare.

Return Value

Type: System.Boolean
true if value matches the beginning of this string; otherwise, false.

ExceptionCondition
ArgumentNullException

value is a null reference (Nothing in Visual Basic).

This method compares value to the substring at the beginning of this instance that is the same length as value, and returns an indication whether they are equal. To be equal, value must be an empty string (String.Empty), must be a reference to this same instance, or must match the beginning of this instance.

This method performs a word (case-sensitive and culture-sensitive) comparison using the current culture.

Notes to Callers

As explained in Best Practices for Using Strings in the .NET Framework, we recommend that you avoid calling string comparison methods that substitute default values and instead call methods that require parameters to be explicitly specified. To determine whether a string begins with a particular substring by using the string comparison rules of the current culture, call the StartsWith(String, StringComparison) method overload with a value of StringComparison.CurrentCulture for its comparisonType parameter.

The following example defines a StripStartTags method that uses the StartsWith(String) method to remove HTML start tags from the beginning of a string. Note that the StripStartTags method is called recursively to ensure that multiple HTML start tags at the beginning of the line are removed. The example does not remove HTML tags embedded in a string.

No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Portable Class Library

Supported in: Portable Class Library
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