topic Re: Checking for existing fields before adding in ArcObjects SDK Questions

Checking for existing fields before adding

KevinYanuk — Thu, 04 Oct 2012 17:40:09 GMT

Hello -

I am trying to check whether a field exists before attempting to create it. The code I have so far is:

private void CreateField(IDataset d, IFeatureClass f, string name, string alias)         {             // IF FIELD DOES NOT EXIST, RETURN, ELSE, CREATE              IField field = new FieldClass();             IFieldEdit fe = (IFieldEdit)field;             fe.Name_2 = name;             fe.AliasName_2 = alias;             fe.Type_2 = esriFieldType.esriFieldTypeString;             fe.Length_2 = 20;             Invoke(new MethodInvoker(delegate { UpdateLabel.Text = "Creating field " + field.Name + "\nfor " + d.Name.Split('.')[1] + "... "; }));             f.AddField(field);         }

Thanks,

Kevin

Re: Checking for existing fields before adding

KenBuja — Sun, 12 Dec 2021 04:46:47 GMT

Use IFeatureClass::FindField to check if a field exists. If it returns -1, the field isn't in the feature class.

if (f.findfield(name) == -1)
     return;

Re: Checking for existing fields before adding

NeilClemmons — Thu, 04 Oct 2012 18:12:30 GMT

Call the FindField method on the feature class' Fields collection. If it returns -1 then the field doesn't exist.

Re: Checking for existing fields before adding

KevinYanuk — Thu, 04 Oct 2012 18:21:55 GMT

Use IFeatureClass::FindField to check if a field exists. If it returns -1, the field isn't in the feature class.
if (f.findfield(name) == -1)      return;

Call the FindField method on the feature class' Fields collection. If it returns -1 then the field doesn't exist.

Excellent, thank you both!