Devexpress-GridLookUpEdit

1.多列模糊查询最简单方式

关于 DevExpress winfom的 GridLookUpEdit控件实现多列过滤的方法，这里介绍一个简单的方式，一个公用方法提供调用即可实现多列过滤。
介绍方法之前，普及一下知识，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);

/// <summary>

        /// 设置GridLookUpEdit多列过滤

        /// </summary>

        /// <param name="repGLUEdit">GridLookUpEdit的知识库，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;

                    //获取GriView私有变量

                    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);

                    //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);

                }));

            };

        }

​