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Asked: 2026-06-04T17:31:27+00:00

I have looked around quite a bit, and nothing seems to answer my question

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I have looked around quite a bit, and nothing seems to answer my question in particular. I have DataGridView in which I add rows and columns dependent on a certain record count of geospatial data that is held in ArcGIS. The data is then passed through to the gridview for editing.

So I do not use any databinding methods, rather it is a very manual process. I store data into a two-dimensional arrays, which indexes are based off of those certain data record counts.

After the loops are complete, the data should be stored in each cell dependent on index. The very last row that was populated is populated perfectly, yet the other 72 (or so) rows are blank.

Here is the code as follows:

This populates column headers (works great):

For i_FieldNum = 0 To pFields_1.FieldCount - 1

        str_FieldName = UCase(pFields_1.Field(i_FieldNum).Name)
        str_FieldAliasName = pFields_1.Field(i_FieldNum).AliasName

        ReDim Preserve m_array_str_FieldNames(i_FieldNum)
        ReDim Preserve m_array_str_FieldAliasNames(i_FieldNum)
        m_array_str_FieldNames(i_FieldNum) = str_FieldName
        m_array_str_FieldAliasNames(i_FieldNum) = str_FieldAliasName

        i_FieldCount = i_FieldCount + 1
        i_ColNum = i_FieldCount - 1

        'If this is the "SHAPE", "FID", or "OBJECTID" field, remember it:
        If (str_FieldName = "SHAPE") Then
            m_i_FieldNum_Shape = i_FieldCount - 1
        ElseIf (str_FieldName = "FID") Then
            m_i_FieldNum_FID = i_FieldCount - 1
        ElseIf (str_FieldName = "OBJECTID") Then
            m_i_FieldNum_OBJECTID = i_FieldCount - 1
        End If

        'Store the field name in the top row:
        grid_Data.ColumnCount = i_FieldCount
        grid_Data.Columns.Item(i_ColNum).HeaderText = str_FieldName

        ReDim Preserve m_array_l_FieldColLengths(i_ColNum)
        m_array_l_FieldColLengths(i_ColNum) = pFields_1.Field(i_FieldNum).Length

    Next i_FieldNum

This populates the two-dimensional array:

 Do Until pFeat_1 Is Nothing
        'Until we run out of features ...

        i_FeatCount = i_FeatCount + 1


        For i_FieldNum = 0 To pFields_1.FieldCount - 1

        'If the field is recorded as a shape
            If (i_FieldNum = m_i_FieldNum_Shape) Then
                array_Data(i_FeatCount - 1, i_FieldNum) = "<Shape>"
            Else

        'If the value of the field is null
                If IsNothing(pFeat_1.Value(i_FieldNum)) Or pFeat_1.Value(i_FieldNum).ToString = "" Then
                    array_Data(i_FeatCount - 1, i_FieldNum) = "<Null>"
                Else

                    array_Data(i_FeatCount - 1, i_FieldNum) = pFeat_1.Value(i_FieldNum).ToString
                End If
            End If

        Next i_FieldNum

        'End If

        'Move to the next feature (if any).
        pFeat_1 = pFeatCursor_1.NextFeature


    Loop

This is suppose to display the data:

 For i_RowNum = 0 To i_FeatCount - 1

        'Add a new row to the grid:
        grid_Data.RowCount = i_RowNum + 2

        For i_ColNum = 0 To pFields_1.FieldCount - 1

            grid_Data.Item(i_ColNum, i_RowNum + 1).Value = array_Data(i_RowNum, i_ColNum)

        Next i_ColNum

    Next i_RowNum

Everything runs and compiles perfectly, although as I stated before, only the last row’s data is shown (which is populated properly).

If anyone can help figure out why only one row is populated, it would be more than appreciated.

Thank You,

Logan

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1 Answer

  1. Editorial Team

    Check your updated section –This is suppose to display the data: If you data is correctly set then as per my guess it making grid to show wrong data. Modify it as per your columns in your grid that you have added. Or you can create column names string array to put data in particular cells. as dgvr.Cells(columnsArray[index]).Value = array[,]

    For i_RowNum = 0 To i_FeatCount - 1

        'Add a new row to the grid:
        DataGridViewRow dgvr = new System.Windows.Forms.DataGridViewRow();
        dgvr.CreateCells(grid_Data)

        For i_ColNum = 0 To pFields_1.FieldCount - 1
            dgvr.Cells(i_ColNum).Value = array_Data(i_RowNum, i_ColNum)
        Next i_ColNum
        grid_Data.Rows.Add(dgvr)
Next i_RowNum

    Ref: Adding a New Row to DataGridView and How to: Manipulate
    Rows in the Windows Forms DataGridView Control

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