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PO"Nullable" property for ADOX table column?
 

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  1. PO"Nullable" property for ADOX table column?
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    <p>I'm trying to create an Access file (.mdb) with C#. I'm exporting data from SQL for a legacy process. I got it working, the only problem I'm facing is setting columns to nullable.</p> <p>Here's what I have (removed most columns for brevity):</p> <pre><code>private void CreateAndExportLegacyFile(DataTable data, string exportFilename) { var connectionString = "Provider=Microsoft.Jet.OLEDB.4.0;"; connectionString += "Data Source=" + exportFilename + ";Jet OLEDB:Engine Type=5"; var catalog = new Catalog(); catalog.Create(connectionString); var table = new Table { Name = "Main" }; #region Column mapping table.Columns.Append("ID", DataTypeEnum.adVarWChar, 50); table.Columns.Append("FIRST", DataTypeEnum.adVarWChar, 50); table.Columns.Append("LAST", DataTypeEnum.adVarWChar, 50); #endregion foreach (Column column in table.Columns) { if (column.Name != "ID") column.Properties["Nullable"].Value = true; } catalog.Tables.Append(table); Marshal.FinalReleaseComObject(table); Marshal.FinalReleaseComObject(catalog.Tables); Marshal.FinalReleaseComObject(catalog.ActiveConnection); Marshal.FinalReleaseComObject(catalog); } </code></pre> <p>I get the following error when trying to set the "Nullable" property: "Item cannot be found in the collection corresponding to the requested name or ordinal."</p> <p>I've found conflicting reports of whether to use Required or Nullable, but I've tried both and get the same result.</p> <p>Any idea why I'm not able to set the nullable property? I may just be lazy and default nulls to blank spaces when pulling the data, but would like to avoid that if possible.</p> <p><strong>Edit</strong>: As Hans mentioned in a comment, I had to use the Attributes property instead:</p> <pre><code>if (column.Name != "ID") column.Attributes = ColumnAttributesEnum.adColNullable; </code></pre>
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    1. USJohn Straka
    1. USJohn Straka
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    1. COUse the Attributes property. Third bullet in http://msdn.microsoft.com/en-us/library/windows/desktop/ms676554%28v=vs.85%29.aspx
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      1. PO"Nullable" property for ADOX table column?
      1. USHans Passant
    2. CO@HansPassant - That worked, thanks! If you'd like to add it as an answer, I'll mark it as accepted.
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      1. USJohn Straka
 

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