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I have an object named 'Account' and the following code:
Account objAcc = new Account();
objAcc.Name = "Test";
The above is working fine, as expected. I now have a list of values as follows:
string props = "Name,Address,Telephone";
Now, what I want to do is see if "Name" exists in that list. I only have the object to use though (hard coding a case statement etc isn't possible as the object is dynamic), so from objAcc.Name, I somehow need to get "Name" from that, and then see if it's in the list.
Thanks in advance, I hope it's clear enough,
Dave
You can use reflection, by doing that :
var properties = objAcc.GetType().GetProperties();
foreach(var property in properties)
{
if(props.Contains(property.Name))
{
//Do you stuff
}
}
string test = objAcc.GetType().GetProperty("Name") == null ? "" : objAcc.GetType().GetProperty("Name").Name;
bool result = "Name,Address,Telephone".Split(',').Contains(test);
You may use the following method if you like:
public bool PropertyExists<T>(string propertyName, IEnumerable<string> propertyList,T obj)
{
string test = obj.GetType().GetProperty(propertyName) == null ? "" : obj.GetType().GetProperty(propertyName).Name;
bool result = propertyList.Contains(test);
return result;
}
Giannis
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I have an object obj1 with 11 properties.
Is it better to do this
Obj obj1 = new Obj()
{
prop1 = int.Parse(data.Rows[0]["RequestId"].ToString())
prop2 = IsBoss = (bool)data.Rows[0]["IsBoss"]
///etc...
}
or should I do
{
Obj obj1 = new Obj(){}
obj1.prop1 = int.Parse(data.Rows[0]["RequestId"].ToString())
obj1.prop2 = IsBoss = (bool)data.Rows[0]["IsBoss"]
///etc...
}
Also as a side question, when my data rows are null, an exception "Input string was not in a correct format" gets thrown because the field from the database is null. Typically the data wouldnt be null but would it be best to use a ternary operator to check if null or should i do a case in the sql qry.
Like the other answers, how you instantiate an object is up to you. Personally, I used to instantiate them and assign the properties all in one statement. The issue that I kept running into is when a had a property that failed to make it back from the database (like your null exception scenario), the the exception wouldn't give me an accurate line number. For that reason, I've moved to instantiating the object, then assigning the properties. This way, you'll know exactly which line/property is causing the issue.
MyClass obj = new MyClass();
obj.PropertyOne = "";
obj.PropertyTwo = "";
//etc...
As far as your second question goes, I handle nulls by using a ternary in combination with the IsDBNull() method on the DataTableReader.
MyClass obj = new MyClass();
obj.PropertyOne = rdr.IsDBNull(rdr.GetOrdinal("RequestId")) ? 0
: rdr.GetInt32(rdr.GetOrdinal("RequestId"));
I prefer setting object properties on initialization as per the first example, I think the code looks cleaner and better contained, but that is more of a personal preference.
For your second question when data is null coming back from the database you've got a few options.
{
var obj1 = new Obj()
{
prop1 = int.TryParse(data.Rows[0]["RequestId"]?.ToString(), out int val) ? val : -1,
prop2 = IsBoss = bool.TryParse(data.Rows[0]["IsBoss"].ToString(), out bool isBoss) ? isBoss : false
}
}
Haven't tested but something like that should work, but it's not clean. I'd separate out the parsing into its own method or block. To help the code breathe a little.
Something like this:
{
if(!(int.TryParse(data.Rows[0]["RequestId"]?.ToString(), out int requestId)))
{
requestId = -1;
}
bool.TryParse(data.Rows[0]["IsBoss"]?.ToString(), out IsBoss);
var obj1 = new Obj()
{
prop1 = requestId,
prop2 = IsBoss
}
}
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I am new to servicestack and using servicestack version 4.5.0.
With reference to the ServiceStack 'session' missing?
Where can I find this base.SessionBag property ? with base keyword I am getting
these intellisense
please help me.
what does this line means:
Inside a Service the dynamic untyped Session Bag was renamed to base.SessionBag.
what does this line means:
Inside a Service the dynamic untyped Session Bag was renamed to base.SessionBag.
when I write base. I find following intellisense
base.Session //-- Property Method
base.SaveSession //--- Extension
base.SessionAs<>
base.SessionFactory //-- Property Method
public class EntryService : Service
{
public object Post(Entry request)
{
var date = request.Time.Date;
var trackedData = (TrackedData)Session= date.ToString();
if(trackedData == null)
trackedData = new TrackedData { Goal = 300 };
trackedData.Total += request.Amount;
Session[date.ToString()] = trackedData;
return new EntryResponse { Id = 1};
}
}
i want like this
Session[date.ToString()] = trackedData;
but an error occurs Cannot apply indexing with [] to an expression of type ServiceStack.CacheAccess.ISession
You have to inherit from ServiceStack's Service base class. You can then access the dynamic Session Bag with base.SessionBag.
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I got a enum like this:
public enum PlatForms
{
AAA=1,
BBB=2,
CCC=3
}
and a function like this:
public List<Something> GetSomething(PlatForms pf)
{
switch(pf)
{
case PlatForms.AAA:
var some = context.table1.Where(x => x.Prop == true);
break;
case PlatForms.BBB:
var some2 = context.table2.Where(x => x.Prop == true);
break;
default:
break;
}
//do convert;
//
}
The difference is table name is not same. How do I rewrite the code to make it simple?
Would something like this work?
You wouldn't want this Dictionary code to run every single time, so as soon as you have your context you could initialize a Dictionary...
var tableTranslation = new Dictionary<Platforms, Context>();
tableTranslation.Add(Platforms.AAA, context.table1);
tableTranslation.Add(Platforms.BBB, context.table2);
Then in your GetSomething() method you could just reference the Dictionary's table.
var some = tableTranslation[pf].Where(x => x.Prop == true);
//do convert
Would that do what you're looking for?
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I need to update EF record, in method I have EF object and another new objct which I want to use to update data from. But I m not sure how to copy data from new object to existing one.
Help please.
Here is my code:
public int PostHomeLead(string _lead)
{
try
{
int result = 0;
Lead lead = new Lead();
lead = new JavaScriptSerializer().Deserialize<Lead>(_lead);
//check if lead exist with same session id, if so update it other wise add new.
Lead existingLead = new Lead();
existingLead = db2.HomeLoanCustRepo.GetByID(lead.Lead_id);
if (existingLead == null)
{
db2.HomeLoanCustRepo.Insert(lead);
db2.Save();
result = 1;
}
else
{
db2.HomeLoanCustRepo.Update(lead);
db2.Save();
result = 1;
}
return result;
}
catch(Exception ex)
{
throw ex;
}
}
Either map the properties manually:
existingLead.Foo = deserializedLead.Foo;
existingLead.Bar = deserializedLead.Bar;
existingLead.Baz = deserializedLead.Baz;
Or use a library that does this, like AutoMapper.
As for your comment, creating a deep copy is what you seem to be after. Note this allows for overposting or mass assignment when you don't verify which properties may be updated. You'll need to Attach() the cloned object when using cloning or mapping, as it will not be the same object as returned by GetByID(), so Entity Framework's change tracker won't recognize it.
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I am trying to create a c# method that can be reused multiple times,but depending on the condition of the variable type, i would like to be able to construct the name of a text field.
For example, if type="TY" then I would like to call
if ((String)this.TYIdlabelChange.Value == null)
However, if type="CA", then I would like to call
if ((String)this.CAIdlabelChange.Value == null)
Other examples:
if ((String)this.DIIdlabelChange.Value == null)
if ((String)this.LOIdlabelChange.Value == null)
if ((String)this.REIdlabelChange.Value == null)
etc...
Any ideas?
Thank you!
You need use Page.FindControl, something like this
var tb = FindControl(type+"IdlabelChange") as Textbox;
if(tb != null && tb.Value != null){
....
}