public static Expression[] NavigationExpression(CompileContext context)
{
/**
* ***Navigation
* if(concreteQuery.UserQuery != null)
* ｛
* {
* var naviQuery = concreteQuery.UserQuery;
* if(naviQuery.Id != null){
* source = source.Where(t=>t.User.Id == naviQuery.Id);
* }
* if(naviQuery.RoleQuery != null){
* var naviQuery_2 = naviQuery.RoleQuery;
*
* }
* }
* ｝
*/
if (context.Depth >= 4)
{
return(null);
}
var suffix = "Query";
var modelProperties = context.ModelProperties;
var blocks = new List <Expression>();
var sourceParam = context.SourceParam;
foreach (var queryProperty in context.QueryProperties.Where(p => p.Name.EndsWith(suffix)))
{
var queryPropertyName = queryProperty.Name;
foreach (var modelProperty in modelProperties)
{
if (queryPropertyName == modelProperty.Name + suffix && typeof(BaseQuery).IsAssignableFrom(queryProperty.PropertyType))
{
var naviBlocks = new List <Expression>();
var naviQueryParam = Expression.Parameter(queryProperty.PropertyType,
"naviQuery_" + (context.Depth + 1));
var naviContext = new CompileContext()
{
Depth = context.Depth + 1,
ModelProperties = modelProperty.PropertyType.GetProperties(),
ModelType = context.ModelType,
QueryParam = naviQueryParam,
QueryProperties = queryProperty.PropertyType.GetProperties(),
SourceParam = sourceParam,
Navigations = context.Navigations.Concat(new [] { modelProperty.Name }).ToArray()
};
naviBlocks.Add(Expression.Assign(naviQueryParam, Expression.Property(context.QueryParam, queryPropertyName)));
naviBlocks.AddRange(EqualExprssion(naviContext));
naviBlocks.AddRange(StringContainExpression(naviContext));
naviBlocks.AddRange(ListContainsExpression(naviContext));
naviBlocks.AddRange(RangeExpression(naviContext));
blocks.Add(Expression.Block(new[] { naviQueryParam }, naviBlocks));
}
}
}
return(blocks.ToArray());
}
public static Expression[] StringContainExpression(CompileContext context)
{
/* ---- StringContains
* if(concreteQuery.NamePattern != null){
* source = source.Where(o=>o.Name.Contains(concreteQuery.NamePattern));
* }
*/
var suffix = "Pattern";
var modelProperties = context.ModelProperties;
var blocks = new List <Expression>();
var queryParam = context.QueryParam;
var sourceParam = context.SourceParam;
var modelType = context.ModelType;
var stringContainMethod = typeof(string).GetMethod("Contains");
Func <Expression, Expression> modelAccess = expr => context.Navigations.Aggregate(expr, Expression.Property);
foreach (var queryProperty in context.QueryProperties.Where(p => p.Name.EndsWith(suffix)))
{
var queryPropertyName = queryProperty.Name;
foreach (var modelProperty in modelProperties)
{
if (queryPropertyName == modelProperty.Name + suffix &&
modelProperty.PropertyType == typeof(string) &&
queryProperty.PropertyType == typeof(string))
{
var whereMethod = WhereMethod(modelType);
var t = Expression.Parameter(modelType, "t");
var predictExpr = Expression.Lambda(
Expression.Call(Expression.Property(modelAccess(t), modelProperty),
stringContainMethod,
new Expression[] { Expression.Property(queryParam, queryProperty) }
),
t
);
var expr =
Expression.IfThen(
Expression.NotEqual(
Expression.Property(queryParam, queryProperty),
Expression.Constant(null)),
Expression.Assign(sourceParam,
Expression.Call(whereMethod,
new Expression[] { sourceParam, predictExpr })
));
blocks.Add(expr);
}
}
}
return(blocks.ToArray());
}
public static Expression[] EqualExprssion(CompileContext context)
{
/**
* * ---- Equals
* if(concreteQuery.ID != null){
* source = source.Where(o=>concreteQuery.ID == o.ID);
* }
*/
var modelProperties = context.ModelProperties;
var blocks = new List <Expression>();
var queryParam = context.QueryParam;
var sourceParam = context.SourceParam;
var modelType = context.ModelType;
Func <Expression, Expression> modelAccess = expr => context.Navigations.Aggregate(expr, Expression.Property);
foreach (var queryProperty in context.QueryProperties)
{
var queryPropertyName = queryProperty.Name;
foreach (var modelProperty in modelProperties)
{
if (queryPropertyName == modelProperty.Name)
{
var whereMethod = WhereMethod(modelType);
var t = Expression.Parameter(modelType, "t");
var predictExpr = Expression.Lambda(
typeof(Func <,>).MakeGenericType(new Type[] { modelType, typeof(bool) }),
Expression.Equal(Expression.Property(queryParam, queryProperty),
Expression.Property(modelAccess(t), modelProperty)),
t
);
var expr =
Expression.IfThen(
Expression.NotEqual(
Expression.Property(queryParam, queryProperty),
Expression.Constant(null)),
Expression.Assign(sourceParam,
Expression.Call(whereMethod, new Expression[] { sourceParam, predictExpr })
));
blocks.Add(expr);
}
}
}
return(blocks.ToArray());
}
/*
*
* IQueryable<TModel> DynamicFunc<TModel>(IQuery<TModel> query, IQueryable<TModel> source)
* {
* var concreteQuery = query as ConcreteQueryType;
* ---- Contains
* if(concreteQuery.IDs != null)
* ｛
* source = source.Where(o=>concreteQuery.IDList.Contains(o.ID));
* ｝
* ---- Equals
* if(concreteQuery.ID != null){
* source = source.Where(o=>concreteQuery.ID == o.ID);
* }
* ---- StringContains
* if(concreteQuery.NamePattern != null){
* source = source.Where(o=>o.Name.Contains(concreteQuery.NamePattern));
* }
* ---- Range
* if(concreteQuery.CreateAtRange != null){
* if(concreteQuery.CreateAtRange.Left != null){
* source = concreteQuery.LeftOpen??source.Where(o=>o.CreateAt > concreteQuery.CreateAtRange.Left):source.Where(o=>o.CreateAtRange>=concreteQuery.CreateAtRange.Left);
* }
* if(concreteQuery.CreateAtRange.Right != null){
* source = concreteQuery.RightOpen??source.Where(o=>o.CreateAt < concreteQuery.CreateAtRange.Right):source.Where(o=>o.CreateAtRange<=concreteQuery.CreateAtRange.Left);
* }
* ---- Take
* if(concreteQuery.Take != null){
* source = sourc.Take(concreteQuery.Take);
* }
* ---- Skip
* if(concreteQuery.Skip != null){
* source = sourc.Skip(concreteQuery.Skip);
* }
* ---- Order
* if(concreteQuery.OrderField != null){
* if(concreteQuery.OrderField == 'ID'){
* source = (concreteQuery.OrderDirection == OrderDirection.ASC)?source.OrderBy(o=>o.ID):source.OrderByDescending(o=>o.ID);
* }
* }
* return source;
* }
*/
public static Func <IQueryable <TModel>, BaseQuery <TModel>, IQueryable <TModel> > Compile <TModel>(BaseQuery query)
where TModel : BaseEntity
{
Func <IQueryable <TModel>, BaseQuery <TModel>, IQueryable <TModel> > handler = null;
var concreteQueryType = query.GetType();
var modelType = query.ModelType;
var queryProperties = concreteQueryType.GetProperties();
var modelProperties = modelType.GetProperties();
var queryParamExpr = Expression.Parameter(typeof(BaseQuery <TModel>), "query");
var concreteQueryExpr = Expression.Parameter(concreteQueryType, "concreteQuery");
var sourceParamExpr = Expression.Parameter(typeof(IQueryable <TModel>), "source");
var context = new CompileContext()
{
ModelProperties = modelProperties,
QueryProperties = queryProperties,
QueryParam = concreteQueryExpr,
SourceParam = sourceParamExpr,
ModelType = modelType,
Depth = 1,
Navigations = new string[0]
};
//Handle Equals
var blocks = new List <Expression>()
{
Expression.Assign(concreteQueryExpr, Expression.Convert(queryParamExpr, concreteQueryType))
};
blocks.AddRange(EqualExprssion(context));
blocks.AddRange(StringContainExpression(context));
blocks.AddRange(ListContainsExpression(context));
blocks.AddRange(RangeExpression(context));
blocks.AddRange(PaginationExpression(context));
blocks.AddRange(NavigationExpression(context));
blocks.Add(sourceParamExpr);
var expr = Expression.Lambda(
Expression.Block(new[] { concreteQueryExpr }, blocks), new[] { sourceParamExpr, queryParamExpr }
);
handler = (Func <IQueryable <TModel>, BaseQuery <TModel>, IQueryable <TModel> >)expr.Compile();
return(handler);
}
public static Expression[] PaginationExpression(CompileContext context)
{
var blocks = new List <Expression>();
/*
* ---- Take
* if(concreteQuery.Take != null){
* source = sourc.Take(concreteQuery.Take);
* }
* ---- Skip
* if(concreteQuery.Skip != null){
* source = sourc.Skip(concreteQuery.Skip);
* }
* ---- Order
* if(concreteQuery.OrderField != null){
* if(concreteQuery.OrderField == 'ID'){
* source = (concreteQuery.OrderDirection == OrderDirection.ASC)?source.OrderBy(o=>o.ID):source.OrderByDescending(o=>o.ID);
* }
* }
* query.Count = source.Count();
*/
var queryParam = context.QueryParam;
var sourceParam = context.SourceParam;
var modelType = context.ModelType;
var defaultOrderField = "Id";
var canOrderedProperties = context.ModelProperties.Where(
pi => pi.PropertyType == typeof(string) || pi.PropertyType.IsValueType).ToArray();
var stringIsNullOrEmptyMethod = typeof(string).GetMethod("IsNullOrEmpty");
var orderFieldProperty = Expression.Property(queryParam, "OrderField");
var orderDirectionProperty = Expression.Property(queryParam, "OrderDirection");
var orderByMethod =
typeof(Queryable).GetMethods().FirstOrDefault(mi => mi.Name == "OrderBy");
var orderByDescendingMethod =
typeof(Queryable).GetMethods()
.FirstOrDefault(mi => mi.Name == "OrderByDescending");
var orderFieldParam = Expression.Parameter(typeof(string), "orderField");
var directionParam = Expression.Parameter(typeof(OrderDirection), "direction");
var exprAssignDefault = Expression.Condition(
Expression.Call(
stringIsNullOrEmptyMethod,
new Expression[] { orderFieldProperty }
),
Expression.Assign(orderFieldParam, Expression.Constant(defaultOrderField)),
Expression.Assign(orderFieldParam, orderFieldProperty)
);
blocks.Add(exprAssignDefault);
blocks.Add(Expression.Condition(
Expression.Equal(orderDirectionProperty, Expression.Constant(null)),
Expression.Assign(directionParam, Expression.Constant(OrderDirection.ASC)),
Expression.Assign(directionParam, Expression.Property(orderDirectionProperty, "Value"))
));
var tempParam = Expression.Parameter(modelType, "t");
var switchCaseExpr =
canOrderedProperties.Select(
property =>
Expression.SwitchCase(
Expression.Condition(
Expression.NotEqual(directionParam,
Expression.Constant(OrderDirection.DESC)),
Expression.Assign(sourceParam,
Expression.Call(
orderByMethod.MakeGenericMethod(new[]
{ modelType, property.PropertyType }),
sourceParam,
Expression.Lambda(
Expression.Property(tempParam,
property.Name),
tempParam))),
Expression.Assign(sourceParam,
Expression.Call(
orderByDescendingMethod
.MakeGenericMethod(new[] { modelType, property.PropertyType }),
sourceParam,
Expression.Lambda(
Expression.Property(tempParam,
property.Name),
tempParam)))),
Expression.Constant(property.Name))
).ToArray();
var switchExpr =
Expression.Switch(orderFieldParam,
Expression.Assign(sourceParam, sourceParam),
switchCaseExpr
);
blocks.Add(switchExpr);
blocks.Add(Expression.Assign(sourceParam,
Expression.Call(
typeof(Compiler).GetMethod("PagerHandler").MakeGenericMethod(modelType),
sourceParam, queryParam)));
var blockExpr = Expression.Block(new ParameterExpression[] { orderFieldParam, directionParam }, blocks);
return(new Expression[] { blockExpr });
}
public static Expression[] RangeExpression(CompileContext context)
{
/* ---- Range
* if(concreteQuery.CreateAtRange != null){
* if(concreteQuery.CreateAtRange.Left != null){
* source = concreteQuery.LeftOpen??source.Where(o=>o.CreateAt > concreteQuery.CreateAtRange.Left):source.Where(o=>o.CreateAtRange>=concreteQuery.CreateAtRange.Left);
* }
* if(concreteQuery.CreateAtRange.Right != null){
* source = concreteQuery.RightOpen??source.Where(o=>o.CreateAt < concreteQuery.CreateAtRange.Right):source.Where(o=>o.CreateAtRange<=concreteQuery.CreateAtRange.Left);
* }
*/
var suffix = "Range";
var modelProperties = context.ModelProperties;
var blocks = new List <Expression>();
var queryParam = context.QueryParam;
var sourceParam = context.SourceParam;
var modelType = context.ModelType;
var whereMethod = WhereMethod(modelType);
Func <Expression, Expression> modelAccess = expr => context.Navigations.Aggregate(expr, Expression.Property);
foreach (var queryProperty in context.QueryProperties.Where(p => p.Name.EndsWith(suffix)))
{
var queryPropertyName = queryProperty.Name;
foreach (var modelProperty in modelProperties)
{
if (queryPropertyName == modelProperty.Name + suffix &&
queryProperty.PropertyType.GetGenericTypeDefinition() == typeof(Range <>))
{
var t = Expression.Parameter(modelType, "t");
var leftLargerThan =
Expression.Call(whereMethod,
new Expression[]
{
sourceParam,
Expression.Lambda(Expression.GreaterThan(
Expression.Property(modelAccess(t), modelProperty),
Expression.Property(
Expression.Property(queryParam, queryProperty), "Left")
),
t)
});
var leftLargerThanOrEqual =
Expression.Call(whereMethod,
new Expression[]
{
sourceParam,
Expression.Lambda(Expression.GreaterThanOrEqual(
Expression.Property(modelAccess(t), modelProperty),
Expression.Property(
Expression.Property(queryParam,
queryProperty),
"Left")
), t)
}
);
var rightLessThan =
Expression.Call(whereMethod,
new Expression[]
{
sourceParam,
Expression.Lambda(Expression.LessThan(
Expression.Property(modelAccess(t), modelProperty),
Expression.Property(
Expression.Property(queryParam, queryProperty), "Right")
), t)
}
);
var rightLessThanOrEuqal =
Expression.Call(whereMethod,
new Expression[]
{
sourceParam,
Expression.Lambda(Expression.LessThanOrEqual(
Expression.Property(modelAccess(t), modelProperty),
Expression.Property(
Expression.Property(queryParam, queryProperty), "Right")), t)
}
);
var expr =
Expression.IfThen(
Expression.NotEqual(
Expression.Property(queryParam, queryProperty),
Expression.Constant(null)),
Expression.Block(new Expression[]
{
Expression.IfThen(
Expression.NotEqual(
Expression.Property(Expression.Property(queryParam, queryProperty),
"Left"),
Expression.Constant(null)
),
Expression.IfThenElse(
Expression.Property(Expression.Property(queryParam, queryProperty),
"LeftOpen"),
Expression.Assign(
sourceParam,
leftLargerThan
),
Expression.Assign(
sourceParam,
leftLargerThanOrEqual
)
)),
Expression.IfThen(
Expression.NotEqual(
Expression.Property(Expression.Property(queryParam, queryProperty),
"Right"),
Expression.Constant(null)
),
Expression.IfThenElse(
Expression.Property(Expression.Property(queryParam, queryProperty),
"RightOpen"),
Expression.Assign(
sourceParam,
rightLessThan
),
Expression.Assign(
sourceParam,
rightLessThanOrEuqal
)
)
)
})
);
blocks.Add(expr);
}
}
}
return(blocks.ToArray());
}
public static Expression[] ListContainsExpression(CompileContext context)
{
/**
* ***Contains
* if(concreteQuery.IDs != null)
* ｛
* source = source.Where(o=>concreteQuery.IDList.Contains(o.ID.Value));
* ｝
*/
var suffix = "List";
var modelProperties = context.ModelProperties;
var blocks = new List <Expression>();
var queryParam = context.QueryParam;
var sourceParam = context.SourceParam;
var modelType = context.ModelType;
var cm = typeof(Enumerable).GetMethods().FirstOrDefault(mi => mi.Name == "Contains");
Func <Expression, Expression> modelAccess = expr => context.Navigations.Aggregate(expr, Expression.Property);
foreach (var queryProperty in context.QueryProperties.Where(p => p.Name.EndsWith(suffix)))
{
var queryPropertyName = queryProperty.Name;
foreach (var modelProperty in modelProperties)
{
var containsMethod = cm;
if (queryPropertyName == modelProperty.Name + suffix &&
queryProperty.PropertyType.IsArray &&
(queryProperty.PropertyType.GetElementType() == modelProperty.PropertyType ||
queryProperty.PropertyType.GetElementType() == Nullable.GetUnderlyingType(modelProperty.PropertyType)))
{
var whereMethod = WhereMethod(modelType);
var t = Expression.Parameter(modelType, "t");
Expression predictExpr;
if (modelProperty.PropertyType == typeof(string))
{
containsMethod = containsMethod.MakeGenericMethod(typeof(string));
predictExpr = Expression.Lambda(
Expression.Call(
containsMethod,
Expression.Property(queryParam, queryProperty),
Expression.Property(modelAccess(t), modelProperty)
),
t
);
}
else
{
containsMethod =
containsMethod.MakeGenericMethod(queryProperty.PropertyType.GetElementType());
predictExpr = Expression.Lambda(
Expression.Call(
containsMethod,
Expression.Property(queryParam, queryProperty),
Expression.Property(Expression.Property(modelAccess(t), modelProperty), "Value")
),
t
);
}
var expr =
Expression.IfThen(
Expression.NotEqual(
Expression.Property(queryParam, queryProperty),
Expression.Constant(null)),
Expression.Assign(sourceParam,
Expression.Call(whereMethod,
new Expression[] { sourceParam, predictExpr })
));
blocks.Add(expr);
}
}
}
return(blocks.ToArray());
}
