public virtual Action <TSource, TTarget, CircularRefChecker> GenerateDefaultCopyToDelegate()
{
Type sType = typeof(TSource);
Type tType = typeof(TTarget);
ParameterExpression sourcePar = Expression.Parameter(sType, "source");
ParameterExpression targetPar = Expression.Parameter(tType, "target");
ParameterExpression targetVar = Expression.Variable(tType);
ParameterExpression crCheckerPar = Expression.Parameter(typeof(CircularRefChecker), "checker");
var g = new PropertyAssignGenerator(sourcePar, targetVar, crCheckerPar, _provider);
var exp = g.GenerateExpression();
List <Expression> expList = new List <Expression>()
{
};
if (exp != null)
{
if (PropertyAssignGenerator.IsDictionaryType(tType))
{
var argTypes = tType.GetGenericArguments();
MethodInfo mi = this.GetType().GetMethod("CopyToDictionay");
mi = mi.MakeGenericMethod(argTypes[0], argTypes[1]);
expList.Add(exp);
expList.Add(Expression.Call(Expression.Constant(this), mi, targetVar, targetPar));
}
else if (PropertyAssignGenerator.IsListType(tType))
{
var argTypes = tType.GetGenericArguments();
MethodInfo mi = this.GetType().GetMethod("CopyToList");
mi = mi.MakeGenericMethod(argTypes[0]);
expList.Add(exp);
expList.Add(Expression.Call(Expression.Constant(this), mi, targetVar, targetPar));
}
else
{
// 单值不存在CopyTo
return((s, t, checker) => { });
}
}
else
{
// 类转换
expList.AddRange(GeneratePropertyAssignExpression(sourcePar, targetPar, crCheckerPar, true));
}
return(Expression.Lambda <Action <TSource, TTarget, CircularRefChecker> >(
Expression.Block(
new ParameterExpression[] { targetVar },
Expression.IfThen(
Expression.NotEqual(Expression.Constant(targetPar), Expression.Constant(null)),
Expression.Block(expList))
), sourcePar, targetPar, crCheckerPar).Compile());
}
public virtual Expression ConvertProperty(ParameterExpression source, ParameterExpression checkerPar, PropertyInfo spi, Expression target, PropertyInfo tpi, bool isCopy, MemberInitExpression excludeProperties)
{
ParameterExpression se = ParameterExpression.Variable(spi.PropertyType);
ParameterExpression te = ParameterExpression.Variable(tpi.PropertyType);
List <Expression> expList = new List <Expression>();
PropertyAssignGenerator g = new PropertyAssignGenerator(se, te, checkerPar, _provider);
Expression e = g.GenerateExpression(true);
if (e != null)
{
expList.Add(Expression.Assign(se, Expression.MakeMemberAccess(source, spi)));
if (isCopy)
{
//拷贝
Type tType = tpi.PropertyType;
if ((tType.IsClass && tType != typeof(string)) ||
PropertyAssignGenerator.IsDictionaryType(tType) ||
PropertyAssignGenerator.IsListType(tType))
{
List <Expression> exp = new List <Expression>();
if (tType.IsClass)
{
exp.Add(Expression.Assign(te, Expression.MakeMemberAccess(target, tpi)));
if (excludeProperties != null)
{
exp.Add(GenerateExcludeAction(spi.PropertyType, tType, se, te, excludeProperties));
}
else
{
exp.Add(g.GenerateCopyToExpression());
}
}
else if (PropertyAssignGenerator.IsDictionaryType(tType))
{
var argTypes = tType.GetGenericArguments();
MethodInfo mi = this.GetType().GetMethod("CopyToDictionay");
mi = mi.MakeGenericMethod(argTypes[0], argTypes[1]);
exp.Add(e);
exp.Add(Expression.Call(Expression.Constant(this), mi, te, Expression.MakeMemberAccess(target, tpi)));
}
else if (PropertyAssignGenerator.IsListType(tType))
{
var argTypes = tType.GetGenericArguments();
MethodInfo mi = this.GetType().GetMethod("CopyToList");
mi = mi.MakeGenericMethod(argTypes[0]);
exp.Add(e);
exp.Add(Expression.Call(Expression.Constant(this), mi, te, Expression.MakeMemberAccess(target, tpi)));
}
// 如果te等于null，new
expList.Add(Expression.IfThenElse(
Expression.Equal(Expression.MakeMemberAccess(target, tpi), Expression.Constant(null)),
Expression.Block(
e,
Expression.Assign(
Expression.MakeMemberAccess(target, tpi),
te)
),
Expression.IfThenElse(
Expression.Equal(se, Expression.Constant(null)),
Expression.Assign(Expression.MakeMemberAccess(target, tpi), Expression.Constant(null, tpi.PropertyType)),
Expression.Block(exp)
)
));
return(Expression.Block(
new ParameterExpression[] { se, te },
expList));
}
}
expList.Add(e);
expList.Add(Expression.Assign(
Expression.MakeMemberAccess(target, tpi),
te));
return(Expression.Block(
new ParameterExpression[] { se, te },
expList));
}
return(null);
}