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    <p>For many many months this was an issue for me and I just avoided underscores when working with SubSonic on any supported DB. Until yesterday when I had to support a legacy project that had underscores in its SQL Server database. </p> <p>You'll have to fix it within the source code of SubSonic.Core (file: SubSonic.Core\Schema\DatabaseTable.cs):</p> <p>Find this method:</p> <pre><code>public IColumn GetColumnByPropertyName(string PropertyName) { return Columns.SingleOrDefault(x =&gt; x.Name.Equals(PropertyName, StringComparison.InvariantCultureIgnoreCase)); } </code></pre> <p>And change it to:</p> <pre><code>public IColumn GetColumnByPropertyName(string PropertyName) { return Columns.SingleOrDefault(x =&gt; x.PropertyName.Equals(PropertyName, StringComparison.InvariantCultureIgnoreCase)); } </code></pre> <p>Next you'll have to modify your <strong>Structs.tt</strong>:</p> <p>Find this near the top:</p> <pre><code>Columns.Add(new DatabaseColumn("&lt;#=col.Name#&gt;", this) { IsPrimaryKey = &lt;#=col.IsPK.ToString().ToLower()#&gt;, DataType = DbType.&lt;#=col.DbType.ToString()#&gt;, IsNullable = &lt;#=col.IsNullable.ToString().ToLower()#&gt;, AutoIncrement = &lt;#=col.AutoIncrement.ToString().ToLower()#&gt;, IsForeignKey = &lt;#=col.IsForeignKey.ToString().ToLower()#&gt;, MaxLength = &lt;#=col.MaxLength#&gt; }); </code></pre> <p>And add this line:</p> <pre><code> PropertyName = "&lt;#=col.CleanName#&gt;", </code></pre> <p>So that it becomes:</p> <pre><code>Columns.Add(new DatabaseColumn("&lt;#=col.Name#&gt;", this) { PropertyName = "&lt;#=col.CleanName#&gt;", IsPrimaryKey = &lt;#=col.IsPK.ToString().ToLower()#&gt;, DataType = DbType.&lt;#=col.DbType.ToString()#&gt;, IsNullable = &lt;#=col.IsNullable.ToString().ToLower()#&gt;, AutoIncrement = &lt;#=col.AutoIncrement.ToString().ToLower()#&gt;, IsForeignKey = &lt;#=col.IsForeignKey.ToString().ToLower()#&gt;, MaxLength = &lt;#=col.MaxLength#&gt; }); </code></pre> <p>The problem is that once you cleaned up the column names, SubSonic tries the find the valid columns in your query by matching your SubSonic generated <strong>property names</strong> against the database's original <strong>column names</strong>.</p> <p>These changes will make sure that SubSonic be matching them against the cleaned <strong>property name</strong>.</p>
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