GridLookUpEdit的知识库是RepositoryItemGridLookUpEdit，切确的说GridLookUpEdit只是RepositoryItemGridLookUpEdit的一个壳而已，

这也就是在GridControl的GridView中，对列绑定的是RepositoryItemGridLookUpEdit而不是GridLookUpEdit的原因，RepositoryItemGridLookUpEdit才是GridLookUpEdit的核心，所以处理这个过滤操作，其实就是对RepositoryItemGridLookUpEdit进行操作，

方法的参数也是RepositoryItemGridLookUpEdit类型，这样在GridView中使用RepositoryItemGridLookUpEdit也可以直接调用。eg:

SetGridLookUpEditMoreColumnFilter(gridLookUpEdit1.Properties);

SetGridLookUpEditMoreColumnFilter(repositoryItemGridLookUpEdit1);

/// 
        /// 设置GridLookUpEdit多列过滤        /// 
        /// GridLookUpEdit的知识库，eg:gridlookUpEdit.Properties        void SetGridLookUpEditMoreColumnFilter(DevExpress.XtraEditors.Repository.RepositoryItemGridLookUpEdit repGLUEdit)        {            repGLUEdit.EditValueChanging += (sender, e) =>            {                this.BeginInvoke(new System.Windows.Forms.MethodInvoker(() => {                    GridLookUpEdit edit = sender as GridLookUpEdit;                    DevExpress.XtraGrid.Views.Grid.GridView view = edit.Properties.View as DevExpress.XtraGrid.Views.Grid.GridView;                    //获取GriView私有变量                    System.Reflection.FieldInfo extraFilter = view.GetType().GetField("extraFilter",System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);                    List
     
       columnsOperators = new List
      
       ();                    foreach (GridColumn col in view.VisibleColumns)                    {                        if (col.Visible && col.ColumnType == typeof(string))                            columnsOperators.Add(new DevExpress.Data.Filtering.FunctionOperator(DevExpress.Data.Filtering.FunctionOperatorType.Contains,                                new DevExpress.Data.Filtering.OperandProperty(col.FieldName),                                new DevExpress.Data.Filtering.OperandValue(edit.Text)));                    }                    string filterCondition = new DevExpress.Data.Filtering.GroupOperator(DevExpress.Data.Filtering.GroupOperatorType.Or, columnsOperators).ToString();                    extraFilter.SetValue(view, filterCondition);                    //获取GriView中处理列过滤的私有方法                    System.Reflection.MethodInfo ApplyColumnsFilterEx = view.GetType().GetMethod("ApplyColumnsFilterEx", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);                    ApplyColumnsFilterEx.Invoke(view, null);                }));            };        }