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体验新版 GitCode,发现更多精彩内容 >>
提交
75e20ae3
编写于
5月 22, 2018
作者:
pk27602017
提交者:
tanghai
5月 23, 2018
浏览文件
操作
浏览文件
下载
电子邮件补丁
差异文件
支持使用外部变量,支持ID搜索
Support Lambda
上级
364842f9
变更
2
隐藏空白更改
内联
并排
Showing
2 changed file
with
156 addition
and
1 deletion
+156
-1
Server/Model/Module/DB/DBCacheComponent.cs
Server/Model/Module/DB/DBCacheComponent.cs
+10
-1
Server/Model/Module/DB/ExpressionVistor.cs
Server/Model/Module/DB/ExpressionVistor.cs
+146
-0
未找到文件。
Server/Model/Module/DB/DBCacheComponent.cs
浏览文件 @
75e20ae3
using
System.Collections.Generic
;
using
System
;
using
System.Collections.Generic
;
using
System.Linq.Expressions
;
using
System.Threading.Tasks
;
namespace
ETModel
...
...
@@ -135,6 +137,13 @@ namespace ETModel
return
tcs
.
Task
;
}
public
Task
<
List
<
ComponentWithId
>>
Get
<
T
>(
string
collectionName
,
Expression
<
Func
<
T
,
bool
>>
func
)
where
T
:
ComponentWithId
{
var
vistor
=
new
ExpressionVistor
(
func
);
return
GetJson
(
collectionName
,
vistor
.
Output
);
}
public
Task
<
List
<
ComponentWithId
>>
GetJson
(
string
collectionName
,
string
json
)
{
TaskCompletionSource
<
List
<
ComponentWithId
>>
tcs
=
new
TaskCompletionSource
<
List
<
ComponentWithId
>>();
...
...
Server/Model/Module/DB/ExpressionVistor.cs
0 → 100644
浏览文件 @
75e20ae3
using
System
;
using
System.Linq.Expressions
;
using
System.Reflection
;
using
System.Text
;
namespace
ETModel
{
public
sealed
class
ExpressionVistor
:
ExpressionVisitor
{
private
readonly
StringBuilder
Builder
=
new
StringBuilder
(
"{"
);
public
string
Output
{
get
{
return
this
.
Builder
.
ToString
();
}
}
private
string
Variable
;
private
ExpressionType
NodeType
;
public
ExpressionVistor
(
Expression
node
)
{
Visit
(
node
);
}
protected
override
Expression
VisitLambda
<
T
>(
Expression
<
T
>
node
)
{
var
lambda
=
base
.
VisitLambda
(
node
);
this
.
Builder
.
Remove
(
this
.
Builder
.
Length
-
1
,
1
);
//Remove the Last Comma
this
.
Builder
.
Append
(
"}"
);
return
lambda
;
}
protected
override
Expression
VisitBinary
(
BinaryExpression
node
)
{
this
.
NodeType
=
node
.
NodeType
;
return
base
.
VisitBinary
(
node
);
}
protected
override
Expression
VisitMember
(
MemberExpression
node
)
{
switch
(
node
.
Expression
.
NodeType
)
{
case
ExpressionType
.
Constant
:
case
ExpressionType
.
MemberAccess
:
{
var
cleanNode
=
GetMemberConstant
(
node
);
return
VisitConstant
(
cleanNode
);
}
}
if
(
node
.
Member
.
Name
!=
nameof
(
ComponentWithId
.
Id
))
this
.
Variable
=
node
.
Member
.
Name
;
else
this
.
Variable
=
"_id"
;
return
base
.
VisitMember
(
node
);
}
private
static
ConstantExpression
GetMemberConstant
(
MemberExpression
node
)
{
object
value
;
if
(
node
.
Member
.
MemberType
==
MemberTypes
.
Field
)
{
value
=
GetFieldValue
(
node
);
}
else
if
(
node
.
Member
.
MemberType
==
MemberTypes
.
Property
)
{
value
=
GetPropertyValue
(
node
);
}
else
{
throw
new
NotSupportedException
();
}
return
Expression
.
Constant
(
value
,
node
.
Type
);
}
protected
override
Expression
VisitConstant
(
ConstantExpression
node
)
{
this
.
Builder
.
Append
(
this
.
Variable
);
bool
flag
=
false
;
if
(
this
.
NodeType
==
ExpressionType
.
Equal
)
{
this
.
Builder
.
Append
(
":"
);
}
else
if
(
this
.
NodeType
==
ExpressionType
.
GreaterThan
)
{
this
.
Builder
.
Append
(
":{"
);
this
.
Builder
.
Append
(
"$gt:"
);
flag
=
true
;
}
else
if
(
this
.
NodeType
==
ExpressionType
.
GreaterThanOrEqual
)
{
this
.
Builder
.
Append
(
":{"
);
this
.
Builder
.
Append
(
"$gte:"
);
flag
=
true
;
}
else
if
(
this
.
NodeType
==
ExpressionType
.
LessThan
)
{
this
.
Builder
.
Append
(
":{"
);
this
.
Builder
.
Append
(
"$lt:"
);
flag
=
true
;
}
else
if
(
this
.
NodeType
==
ExpressionType
.
LessThanOrEqual
)
{
this
.
Builder
.
Append
(
":{"
);
this
.
Builder
.
Append
(
"lte:"
);
flag
=
true
;
}
this
.
Builder
.
Append
(
node
.
Value
);
if
(
flag
)
this
.
Builder
.
Append
(
"}"
);
this
.
Builder
.
Append
(
","
);
return
base
.
VisitConstant
(
node
);
}
private
static
object
GetFieldValue
(
MemberExpression
node
)
{
var
fieldInfo
=
(
FieldInfo
)
node
.
Member
;
var
instance
=
(
node
.
Expression
==
null
)
?
null
:
TryEvaluate
(
node
.
Expression
).
Value
;
return
fieldInfo
.
GetValue
(
instance
);
}
private
static
object
GetPropertyValue
(
MemberExpression
node
)
{
var
propertyInfo
=
(
PropertyInfo
)
node
.
Member
;
var
instance
=
(
node
.
Expression
==
null
)
?
null
:
TryEvaluate
(
node
.
Expression
).
Value
;
return
propertyInfo
.
GetValue
(
instance
,
null
);
}
private
static
ConstantExpression
TryEvaluate
(
Expression
expression
)
{
if
(
expression
.
NodeType
==
ExpressionType
.
Constant
)
{
return
(
ConstantExpression
)
expression
;
}
throw
new
NotSupportedException
();
}
}
}
\ No newline at end of file
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