我错误地输入了一个命令并且很困惑为什么它仍然有效。例如：
PS [73] D:\ > $x = "test","me"
PS [74] D:\ > get-typename $x
String[]
PS [75] D:\ > $x.replace("e","x")
txst
mx
这是否意味着我总是可以在String []上调用String方法（或任何objtype），并且在不使用foreach的情况下将它神奇地应用于每个元素？是否有一些（未记录的？）隐式演员正在进行？
编辑：更加困惑。当Object和Object []具有相同的方法名称时会发生什么？示例：第一个示例很简单; Int32有一个ToUint16，但是Int32 []没有，所以隐含的foreach是合乎逻辑的：
PS [119] C:\ > [int32[]]$x = 1,2,3
PS [120] C:\ > $x.ToUInt16([System.Globalization.DateTimeFormatInfo]::CurrentInfo)
1
2
3
PS [121] C:\ > $x | % {$_.ToUInt16([System.Globalization.DateTimeFormatInfo]::CurrentInfo)}
1
2
3
但是在这里，两种类型都有ToString（）方法。而神奇暗示着foreach dissapears：
PS [122] C:\ > $x | % { $_.ToString() }
1
2
3
PS [123] C:\ > $x.ToString()
System.Int32[]
答案 0 :(得分：-3)
简答：是的，String数组对象上存在Replace方法。
答案很长：
PS C:\Users\TheIncorrigible1> $x | GM | ft -AutoSize -Wrap
TypeName Name MemberType Definition
-------- ---- ---------- ----------
System.String Clone Method System.Object Clone(),
System.Object
ICloneable.Clone()
System.String CompareTo Method int CompareTo(System.Object
value), int
CompareTo(string strB), int
IComparable.CompareTo(System
.Object obj), int IComparabl
e[string].CompareTo(string
other)
System.String Contains Method bool Contains(string value)
System.String CopyTo Method void CopyTo(int
sourceIndex, char[]
destination, int
destinationIndex, int count)
System.String EndsWith Method bool EndsWith(string
value), bool
EndsWith(string value,
System.StringComparison
comparisonType), bool
EndsWith(string value, bool
ignoreCase, cultureinfo
culture)
System.String Equals Method bool Equals(System.Object
obj), bool Equals(string
value), bool Equals(string
value,
System.StringComparison
comparisonType), bool IEquat
able[string].Equals(string
other)
System.String GetEnumerator Method System.CharEnumerator
GetEnumerator(), System.Coll
ections.IEnumerator IEnumera
ble.GetEnumerator(), System.
Collections.Generic.IEnumera
tor[char] IEnumerable[char].
GetEnumerator()
System.String GetHashCode Method int GetHashCode()
System.String GetType Method type GetType()
System.String GetTypeCode Method System.TypeCode
GetTypeCode(),
System.TypeCode
IConvertible.GetTypeCode()
System.String IndexOf Method int IndexOf(char value),
int IndexOf(char value, int
startIndex), int
IndexOf(char value, int
startIndex, int count), int
IndexOf(string value), int
IndexOf(string value, int
startIndex), int
IndexOf(string value, int
startIndex, int count), int
IndexOf(string value,
System.StringComparison
comparisonType), int
IndexOf(string value, int
startIndex,
System.StringComparison
comparisonType), int
IndexOf(string value, int
startIndex, int count,
System.StringComparison
comparisonType)
System.String IndexOfAny Method int IndexOfAny(char[]
anyOf), int
IndexOfAny(char[] anyOf,
int startIndex), int
IndexOfAny(char[] anyOf,
int startIndex, int count)
System.String Insert Method string Insert(int
startIndex, string value)
System.String IsNormalized Method bool IsNormalized(), bool Is
Normalized(System.Text.Norma
lizationForm
normalizationForm)
System.String LastIndexOf Method int LastIndexOf(char
value), int
LastIndexOf(char value, int
startIndex), int
LastIndexOf(char value, int
startIndex, int count), int
LastIndexOf(string value),
int LastIndexOf(string
value, int startIndex), int
LastIndexOf(string value,
int startIndex, int count),
int LastIndexOf(string
value,
System.StringComparison
comparisonType), int
LastIndexOf(string value,
int startIndex,
System.StringComparison
comparisonType), int
LastIndexOf(string value,
int startIndex, int count,
System.StringComparison
comparisonType)
System.String LastIndexOfAny Method int LastIndexOfAny(char[]
anyOf), int
LastIndexOfAny(char[]
anyOf, int startIndex), int
LastIndexOfAny(char[]
anyOf, int startIndex, int
count)
System.String Normalize Method string Normalize(), string N
ormalize(System.Text.Normali
zationForm
normalizationForm)
System.String PadLeft Method string PadLeft(int
totalWidth), string
PadLeft(int totalWidth,
char paddingChar)
System.String PadRight Method string PadRight(int
totalWidth), string
PadRight(int totalWidth,
char paddingChar)
System.String Remove Method string Remove(int
startIndex, int count),
string Remove(int
startIndex)
System.String Replace Method string Replace(char
oldChar, char newChar),
string Replace(string
oldValue, string newValue)
System.String Split Method string[] Split(Params
char[] separator), string[]
Split(char[] separator, int
count), string[]
Split(char[] separator,
System.StringSplitOptions
options), string[]
Split(char[] separator, int
count,
System.StringSplitOptions
options), string[]
Split(string[] separator,
System.StringSplitOptions
options), string[]
Split(string[] separator,
int count,
System.StringSplitOptions
options)
System.String StartsWith Method bool StartsWith(string
value), bool
StartsWith(string value,
System.StringComparison
comparisonType), bool
StartsWith(string value,
bool ignoreCase,
cultureinfo culture)
System.String Substring Method string Substring(int
startIndex), string
Substring(int startIndex,
int length)
System.String ToBoolean Method bool IConvertible.ToBoolean(
System.IFormatProvider
provider)
System.String ToByte Method byte IConvertible.ToByte(Sys
tem.IFormatProvider
provider)
System.String ToChar Method char IConvertible.ToChar(Sys
tem.IFormatProvider
provider)
System.String ToCharArray Method char[] ToCharArray(),
char[] ToCharArray(int
startIndex, int length)
System.String ToDateTime Method datetime IConvertible.ToDate
Time(System.IFormatProvider
provider)
System.String ToDecimal Method decimal IConvertible.ToDecim
al(System.IFormatProvider
provider)
System.String ToDouble Method double IConvertible.ToDouble
(System.IFormatProvider
provider)
System.String ToInt16 Method int16 IConvertible.ToInt16(S
ystem.IFormatProvider
provider)
System.String ToInt32 Method int IConvertible.ToInt32(Sys
tem.IFormatProvider
provider)
System.String ToInt64 Method long IConvertible.ToInt64(Sy
stem.IFormatProvider
provider)
System.String ToLower Method string ToLower(), string
ToLower(cultureinfo culture)
System.String ToLowerInvariant Method string ToLowerInvariant()
System.String ToSByte Method sbyte IConvertible.ToSByte(S
ystem.IFormatProvider
provider)
System.String ToSingle Method float IConvertible.ToSingle(
System.IFormatProvider
provider)
System.String ToString Method string ToString(), string To
String(System.IFormatProvide
r provider), string IConvert
ible.ToString(System.IFormat
Provider provider)
System.String ToType Method System.Object
IConvertible.ToType(type
conversionType,
System.IFormatProvider
provider)
System.String ToUInt16 Method uint16 IConvertible.ToUInt16
(System.IFormatProvider
provider)
System.String ToUInt32 Method uint32 IConvertible.ToUInt32
(System.IFormatProvider
provider)
System.String ToUInt64 Method uint64 IConvertible.ToUInt64
(System.IFormatProvider
provider)
System.String ToUpper Method string ToUpper(), string
ToUpper(cultureinfo culture)
System.String ToUpperInvariant Method string ToUpperInvariant()
System.String Trim Method string Trim(Params char[]
trimChars), string Trim()
System.String TrimEnd Method string TrimEnd(Params
char[] trimChars)
System.String TrimStart Method string TrimStart(Params
char[] trimChars)
System.String Chars ParameterizedProperty char Chars(int index) {get;}
System.String Length Property int Length {get;}