XmlDictionary.TryLookup 方法
定义
尝试在字典中查找项。Attempts to look up an entry in the dictionary.
重载
| TryLookup(Int32, XmlDictionaryString) |
尝试在字典中查找项。Attempts to look up an entry in the dictionary. |
| TryLookup(String, XmlDictionaryString) |
检查字典中是否有指定的字符串值。Checks the dictionary for a specified string value. |
| TryLookup(XmlDictionaryString, XmlDictionaryString) |
检查字典中是否有指定的 XmlDictionaryString。Checks the dictionary for a specified XmlDictionaryString. |
注解
如果字符串当前不在字典中,则此方法可避免引发异常。This method avoids throwing an exception if the string is not currently in the dictionary.
TryLookup(Int32, XmlDictionaryString)
尝试在字典中查找项。Attempts to look up an entry in the dictionary.
public:
virtual bool TryLookup(int key, [Runtime::InteropServices::Out] System::Xml::XmlDictionaryString ^ % result);
public virtual bool TryLookup (int key, out System.Xml.XmlDictionaryString result);
public virtual bool TryLookup (int key, out System.Xml.XmlDictionaryString? result);
abstract member TryLookup : int * XmlDictionaryString -> bool
override this.TryLookup : int * XmlDictionaryString -> bool
Public Overridable Function TryLookup (key As Integer, ByRef result As XmlDictionaryString) As Boolean
参数
- key
- Int32
要查找的键。Key to look up.
- result
- XmlDictionaryString
如果已定义 key,则 XmlDictionaryString 映射到该键;否则为 null。If key is defined, the XmlDictionaryString that is mapped to the key; otherwise null.
返回
如果键在字典中,则为 true;否则为 false。true if key is in the dictionary; otherwise, false.
实现
适用于
TryLookup(String, XmlDictionaryString)
检查字典中是否有指定的字符串值。Checks the dictionary for a specified string value.
public:
virtual bool TryLookup(System::String ^ value, [Runtime::InteropServices::Out] System::Xml::XmlDictionaryString ^ % result);
public virtual bool TryLookup (string value, out System.Xml.XmlDictionaryString result);
public virtual bool TryLookup (string value, out System.Xml.XmlDictionaryString? result);
abstract member TryLookup : string * XmlDictionaryString -> bool
override this.TryLookup : string * XmlDictionaryString -> bool
Public Overridable Function TryLookup (value As String, ByRef result As XmlDictionaryString) As Boolean
参数
- value
- String
要检查的字符串值。String value being checked for.
- result
- XmlDictionaryString
如果找到,则为相应的 XmlDictionaryString;否则为 null。The corresponding XmlDictionaryString, if found; otherwise null.
返回
如果值在字典中,则为 true;否则为 false。true if value is in the dictionary; otherwise, false.
实现
例外
value 为 null。value is null.
适用于
TryLookup(XmlDictionaryString, XmlDictionaryString)
检查字典中是否有指定的 XmlDictionaryString。Checks the dictionary for a specified XmlDictionaryString.
public:
virtual bool TryLookup(System::Xml::XmlDictionaryString ^ value, [Runtime::InteropServices::Out] System::Xml::XmlDictionaryString ^ % result);
public virtual bool TryLookup (System.Xml.XmlDictionaryString value, out System.Xml.XmlDictionaryString result);
public virtual bool TryLookup (System.Xml.XmlDictionaryString value, out System.Xml.XmlDictionaryString? result);
abstract member TryLookup : System.Xml.XmlDictionaryString * XmlDictionaryString -> bool
override this.TryLookup : System.Xml.XmlDictionaryString * XmlDictionaryString -> bool
Public Overridable Function TryLookup (value As XmlDictionaryString, ByRef result As XmlDictionaryString) As Boolean
参数
- value
- XmlDictionaryString
要检查的 XmlDictionaryString。The XmlDictionaryString being checked for.
- result
- XmlDictionaryString
如果找到,则为匹配的 XmlDictionaryString;否则为 null。The matching XmlDictionaryString, if found; otherwise, null.
返回
如果 true 在字典中,则为 XmlDictionaryString;否则为 false。true if XmlDictionaryString is in the dictionary; otherwise, false.
实现
例外
value 为 null。value is null.