topic How to set IFeatureClass instance onOpenFileDialog() in ArcObjects SDK Questions

How to set IFeatureClass instance onOpenFileDialog()

BernardoG_ — Wed, 25 Jul 2012 21:42:10 GMT

Hi,
I tried to figure this out alot but I am really stuck! I would like to list fields of a selected shapefile by using OpenFileDialog class but I am getting error on IFeatureClass featureClass part.I think should not use the OpenFeatureClass() method here but honestly I am just lost!
Can you please take a look at following code and point me what I am doing wrong?Do I really need to create all of Workspaces to access a shapefile in C#?

 OpenFileDialog ofd = new OpenFileDialog();             ofd.Filter = "Shapefiles (*.shp)|*.shp";             if (ofd.ShowDialog() == DialogResult.OK)             {                 string path = ofd.FileName;                 fieldName = ofd.SafeFileName;              try                 {                     ESRI.ArcGIS.Geodatabase.IWorkspaceFactory workspaceFactory = new ESRI.ArcGIS.DataSourcesFile.ShapefileWorkspaceFactoryClass();                     ESRI.ArcGIS.Geodatabase.IWorkspace workspace = workspaceFactory.OpenFromFile(ofd.FileName, 0);                     ESRI.ArcGIS.Geodatabase.IFeatureWorkspace featureWorkspace = (ESRI.ArcGIS.Geodatabase.IFeatureWorkspace)workspace; // Explict Cast                     ESRI.ArcGIS.Geodatabase.IFeatureClass featureClass = featureWorkspace.OpenFeatureClass(ofd.SafeFileName);                     IFields fields = featureClass.Fields;                     IField field = null;                      // On a zero based index, iterate through the fields in the collection.                     for (int i = 0; i < fields.FieldCount; i++)                     {                         // Get the field at the given index.                         field = fields.get_Field(i);                         if (field.Name != field.AliasName)                         {                             listBox1.Items.Add(field.Name);                         }                     }                     }                 catch (Exception ex)                 {                     MessageBox.Show(ex.ToString());                 }

Re: How to set IFeatureClass instance onOpenFileDialog()

FengZhang2 — Wed, 25 Jul 2012 23:21:45 GMT

Please refer to the following code snippets:

-- Add Shapefile Using OpenFileDialog Snippet --
http://help.arcgis.com/en/sdk/10.0/arcobjects_net/componenthelp/index.html#//00490000005m000000

Basically, you do like this:

string shapefileLocation = openFileDialog.FileName; ... ESRI.ArcGIS.Geodatabase.IFeatureClass featureClass = featureWorkspace.OpenFeatureClass(System.IO.Path.GetFileNameWithoutExtension(shapefileLocation));

 OpenFileDialog ofd = new OpenFileDialog();             ofd.Filter = "Shapefiles (*.shp)|*.shp";             if (ofd.ShowDialog() == DialogResult.OK)             {                 string path = ofd.FileName;                 fieldName = ofd.SafeFileName;              try                 {                     ESRI.ArcGIS.Geodatabase.IWorkspaceFactory workspaceFactory = new ESRI.ArcGIS.DataSourcesFile.ShapefileWorkspaceFactoryClass();                     ESRI.ArcGIS.Geodatabase.IWorkspace workspace = workspaceFactory.OpenFromFile(ofd.FileName, 0);                     ESRI.ArcGIS.Geodatabase.IFeatureWorkspace featureWorkspace = (ESRI.ArcGIS.Geodatabase.IFeatureWorkspace)workspace; // Explict Cast                     ESRI.ArcGIS.Geodatabase.IFeatureClass featureClass = featureWorkspace.OpenFeatureClass(ofd.SafeFileName);                     IFields fields = featureClass.Fields;                     IField field = null;                      // On a zero based index, iterate through the fields in the collection.                     for (int i = 0; i < fields.FieldCount; i++)                     {                         // Get the field at the given index.                         field = fields.get_Field(i);                         if (field.Name != field.AliasName)                         {                             listBox1.Items.Add(field.Name);                         }                     }                     }                 catch (Exception ex)                 {                     MessageBox.Show(ex.ToString());                 }

Re: How to set IFeatureClass instance onOpenFileDialog()

BernardoG_ — Thu, 26 Jul 2012 00:38:55 GMT

Hi Feng
Thanks for your comment.I will test tour point tomorrow.Do you think I still need to instantiate workspaceFactory and featureWorkspace form IWorkspaceFactory and IWorkspace? Can I just instantiate the IFeatureClass and retrieve the fields of the shapefile?

Thanks again for your comment

Re: How to set IFeatureClass instance onOpenFileDialog()

FengZhang2 — Fri, 10 Dec 2021 21:24:59 GMT

Yes, you still need to create IWorkspaceFactory and IFeatureWorkspace objects as shown in the sample code.

...
// Create a new ShapefileWorkspaceFactory CoClass to create a new workspace
ESRI.ArcGIS.Geodatabase.IWorkspaceFactory workspaceFactory = new ESRI.ArcGIS.DataSourcesFile.ShapefileWorkspaceFactoryClass();

// System.IO.Path.GetDirectoryName(shapefileLocation) returns the directory part of the string. Example: "C:\test\"
ESRI.ArcGIS.Geodatabase.IFeatureWorkspace featureWorkspace = (ESRI.ArcGIS.Geodatabase.IFeatureWorkspace)workspaceFactory.OpenFromFile(System.IO.Path.GetDirectoryName(shapefileLocation), 0); // Explicit Cast

// System.IO.Path.GetFileNameWithoutExtension(shapefileLocation) returns the base filename (without extension). Example: "cities"
ESRI.ArcGIS.Geodatabase.IFeatureClass featureClass = featureWorkspace.OpenFeatureClass(System.IO.Path.GetFileNameWithoutExtension(shapefileLocation));
....

Hi Feng
Thanks for your comment.I will test tour point tomorrow.Do you think I still need to instantiate workspaceFactory and featureWorkspace form IWorkspaceFactory and IWorkspace? Can I just instantiate the IFeatureClass and retrieve the fields of the shapefile?

Thanks again for your comment

Re: How to set IFeatureClass instance onOpenFileDialog()

BernardoG_ — Thu, 26 Jul 2012 14:47:22 GMT

Perfect,
It works now.
Thanks,

Re: How to set IFeatureClass instance onOpenFileDialog()

KenBuja — Fri, 10 Dec 2021 21:25:02 GMT

Have you thought about using the IGxDialog class to open the dataset? This way, you don't have to worry about getting the correct workspace and factory. Here's an example in VB.NET

        Dim pGxDialog As New ESRI.ArcGIS.CatalogUI.GxDialog
        Dim pFilter As ESRI.ArcGIS.Catalog.IGxObjectFilter = New ESRI.ArcGIS.Catalog.GxFilterShapefiles
        Dim pSelection As ESRI.ArcGIS.Catalog.IEnumGxObject
        Dim pGxObject As ESRI.ArcGIS.Catalog.IGxObject
        Dim pFClass As ESRI.ArcGIS.Geodatabase.IFeatureClass

        With pGxDialog
            .AllowMultiSelect = False
            .ObjectFilter = pFilter
        End With

        If pGxDialog.DoModalOpen(My.ArcMap.Application.hWnd, pSelection) Then
            pSelection.Reset()
            pGxObject = pSelection.Next
            pFClass = pGxObject.InternalObjectName.Open
        End If