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不能将列设置为空。请改用DBNull的解决方法,错误

SimpleTranslationEngine中
internal override DataTable FillDataTable(InitializedTranslation translation, IEnumerable data)
{
var dataTable = translation.Structures[this.Name].Clone();
dataTable.TableNewRow += AssignTableNewRowEvent(translation);
if (data == null)
{
return dataTable;
}
foreach (var x in data)
{
/* ReSharper disable once CompareNonConstrainedGenericWithNull
I have Jon Skeet's express permission to ignore this warning :)
(http://stackoverflow.com/questions/5340817/what-should-i-do-about-possible-compare-of-value-type-with-null) */
if (x == null)
{
continue;
}
var row = dataTable.NewRow();
foreach (var colConfig in translation.ColumnConfigurations)
{
var d = GetColumnValue(x, colConfig);
// bool b = typeof(int?).IsValueType;
if (colConfig.ColumnDataType.IsValueType)
{
if (d == null)
{
d = DBNull.Value;
}
}
row[BuildFullColumnName(colConfig.ColumnName, translation)] = d;
}
dataTable.Rows.Add(row);
}
return dataTable;
}

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