GridLookUpEdit多列模糊查詢最簡單方式

轉自：https://www.dxper.net/thread-8478-1-1.html

關于 DevExpress winfom的 GridLookUpEdit控件實作多列過濾的方法，這裡介紹一個簡單的方式，一個公用方法提供調用即可實作多列過濾。

介紹方法之前，普及一下知識，GridLookUpEdit的知識庫是RepositoryItemGridLookUpEdit，切确的說GridLookUpEdit隻是RepositoryItemGridLookUpEdit的一個殼而已，

這也就是在GridControl的GridView中，對列綁定的是RepositoryItemGridLookUpEdit而不是GridLookUpEdit的原因，RepositoryItemGridLookUpEdit才是GridLookUpEdit的核心，是以處理這個過濾操作，其實就是對RepositoryItemGridLookUpEdit進行操作，

方法的參數也是RepositoryItemGridLookUpEdit類型，這樣在GridView中使用RepositoryItemGridLookUpEdit也可以直接調用。eg:

SetGridLookUpEditMoreColumnFilter(gridLookUpEdit1.Properties);

SetGridLookUpEditMoreColumnFilter(repositoryItemGridLookUpEdit1);

/// <summary>
/// 設定GridLookUpEdit多列過濾
/// </summary>
/// <param name="repGLUEdit">GridLookUpEdit的知識庫，eg:gridlookUpEdit.Properties</param>
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;
            //擷取GriView私有變量
            System.Reflection.FieldInfo extraFilter = view.GetType().GetField("extraFilter",System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);
            List<DevExpress.Data.Filtering.CriteriaOperator> columnsOperators = new List<DevExpress.Data.Filtering.CriteriaOperator>();
            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);
            //擷取GriView中處理列過濾的私有方法
            System.Reflection.MethodInfo ApplyColumnsFilterEx = view.GetType().GetMethod("ApplyColumnsFilterEx", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);
            ApplyColumnsFilterEx.Invoke(view, null);
        }));
    };
}