Question

I am trying to build on the “WebSharingAppDemo-SqlProviderEndToEnd” msdn sample application to build out a custom MSF implementation. As part of that I added parameterized filters to the provisioning. I have been referencing http://jtabadero.wordpress.com/2010/09/02/sync-framework-provisioning/ for some idea of how to do this. Now that I have that in place, when I re-initialize the “peer1” database and try to provision it initially I now get an error:

Scopes not created from a template cannot have FilterParameters.
Parameter ‘@my_param_name’ was found on Table ‘[my_table_name]’.
Please ensure that no FilterParameters are being defined on a scope
that is not created from a template.

The only guess I have as to what a “template” is, is the provisioning templates that the Sync Toolkit’s tools can work with, but I don’t think that applies in the scenario I’m working with.

I have been unable to find anything that would indicate what I should do to fix this. So how can I get past this error but still provision my database with parameterized filters?

The below code is what I’m using to build the filtering into the provisioning (SqlSyncScopeProvisioning) object.

private void AddFiltersToProvisioning(IEnumerable<TableInfo> tables)
{
    IEnumerable<FilterColumn> filters = this.GetFilterColumnInfo();
    foreach (TableInfo tblInfo in tables)
    {
        this.AddFiltersForTable(tblInfo, filters);
    }
}

private void AddFiltersForTable(TableInfo tblInfo, IEnumerable<FilterColumn> filters)
{
    IEnumerable<FilterColumn> tblFilters;
    tblFilters = filters.Where(x => x.FilterLevelID == tblInfo.FilterLevelID);
    if (tblFilters != null && tblFilters.Count() > 0)
    {
        var tblDef = this.GetTableColumns(tblInfo.TableName);
        StringBuilder filterClause = new StringBuilder();
        foreach (FilterColumn column in tblFilters)
        {
            this.AddColumnFilter(tblDef, column.ColumnName, filterClause);
        }

        this.Provisioning.Tables[tblInfo.TableName].FilterClause = filterClause.ToString();
    }
}

private void AddColumnFilter(IEnumerable<TableColumnInfo> tblDef, string columnName, StringBuilder filterClause)
{
    TableColumnInfo columnInfo;
    columnInfo = tblDef.FirstOrDefault(x => x.ColumnName.Equals(columnName, StringComparison.CurrentCultureIgnoreCase));
    if (columnInfo != null)
    {
        this.FlagColumnForFiltering(columnInfo.TableName, columnInfo.ColumnName);
        this.BuildFilterClause(filterClause, columnInfo.ColumnName);
        this.AddParamter(columnInfo);
    }
}

private void FlagColumnForFiltering(string tableName, string columnName)
{
    this.Provisioning.Tables[tableName].AddFilterColumn(columnName);
}

private void BuildFilterClause(StringBuilder filterClause, string columnName)
{
    if (filterClause.Length > 0)
    {
        filterClause.Append(" AND ");
    }

    filterClause.AppendFormat("[base].[{0}] = @{0}", columnName);
}

private void AddParamter(TableColumnInfo columnInfo)
{
    SqlParameter parameter = new SqlParameter("@" + columnInfo.ColumnName, columnInfo.GetSqlDataType());
    if (columnInfo.DataTypeLength > 0)
    {
        parameter.Size = columnInfo.DataTypeLength;
    }

    this.Provisioning.Tables[columnInfo.TableName].FilterParameters.Add(parameter);
}

Answer 1

i guess the error is self-explanatory.

the FilterParameters can only be set if the scope inherits from a filter template. you cannot set the FilterParameters for a normal scope, only FilterClause.

Using parameter-based filters is a two step process: Defining the filter/scope template and creating a scope based on a template.

I suggest you re-read the blog entry again and jump to the section Parameter-based Filters.