MemoryExtensions.StartsWith 方法

定义

重载

StartsWith(ReadOnlySpan<Char>, ReadOnlySpan<Char>, StringComparison)

使用指定的 StringComparison 值进行比较时,确定只读字符跨度是否以指定值开头。

StartsWith<T>(Span<T>, ReadOnlySpan<T>)

确定指定的序列是否出现在跨度的开头。

StartsWith<T>(ReadOnlySpan<T>, ReadOnlySpan<T>)

确定指定的序列是否出现在只读跨度的开头。

StartsWith(ReadOnlySpan<Char>, ReadOnlySpan<Char>, StringComparison)

使用指定的 StringComparison 值进行比较时,确定只读字符跨度是否以指定值开头。

public:
[System::Runtime::CompilerServices::Extension]
 static bool StartsWith(ReadOnlySpan<char> span, ReadOnlySpan<char> value, StringComparison comparisonType);
public static bool StartsWith (this ReadOnlySpan<char> span, ReadOnlySpan<char> value, StringComparison comparisonType);
static member StartsWith : ReadOnlySpan<char> * ReadOnlySpan<char> * StringComparison -> bool
<Extension()>
Public Function StartsWith (span As ReadOnlySpan(Of Char), value As ReadOnlySpan(Of Char), comparisonType As StringComparison) As Boolean

参数

span
ReadOnlySpan<Char>

源跨度。

value
ReadOnlySpan<Char>

要与源跨度的开头进行比较的序列。

comparisonType
StringComparison

用于确定如何比较 spanvalue 的枚举值。

返回

如果 valuespan 的开头匹配,则为 true;否则为 false

适用于

StartsWith<T>(Span<T>, ReadOnlySpan<T>)

确定指定的序列是否出现在跨度的开头。

public:
generic <typename T>
 where T : IEquatable<T>[System::Runtime::CompilerServices::Extension]
 static bool StartsWith(Span<T> span, ReadOnlySpan<T> value);
public static bool StartsWith<T> (this Span<T> span, ReadOnlySpan<T> value) where T : IEquatable<T>;
static member StartsWith : Span<'T (requires 'T :> IEquatable<'T>)> * ReadOnlySpan<'T (requires 'T :> IEquatable<'T>)> -> bool (requires 'T :> IEquatable<'T>)
<Extension()>
Public Function StartsWith(Of T As IEquatable(Of T)) (span As Span(Of T), value As ReadOnlySpan(Of T)) As Boolean

类型参数

T

跨度中元素的类型。

参数

span
Span<T>

要搜索的跨度。

value
ReadOnlySpan<T>

要在 span 的开头搜索的序列。

返回

如果 valuespan 的开头匹配,则为 true;否则为 false

适用于

StartsWith<T>(ReadOnlySpan<T>, ReadOnlySpan<T>)

确定指定的序列是否出现在只读跨度的开头。

public:
generic <typename T>
 where T : IEquatable<T>[System::Runtime::CompilerServices::Extension]
 static bool StartsWith(ReadOnlySpan<T> span, ReadOnlySpan<T> value);
public static bool StartsWith<T> (this ReadOnlySpan<T> span, ReadOnlySpan<T> value) where T : IEquatable<T>;
static member StartsWith : ReadOnlySpan<'T (requires 'T :> IEquatable<'T>)> * ReadOnlySpan<'T (requires 'T :> IEquatable<'T>)> -> bool (requires 'T :> IEquatable<'T>)
<Extension()>
Public Function StartsWith(Of T As IEquatable(Of T)) (span As ReadOnlySpan(Of T), value As ReadOnlySpan(Of T)) As Boolean

类型参数

T

范围中元素的类型。

参数

span
ReadOnlySpan<T>

要搜索的只读字符跨度。

value
ReadOnlySpan<T>

要在 span 的开头搜索的序列。

返回

如果 valuespan 的开头匹配,则为 true;否则为 false

适用于