GridLookUpEdit多列模糊查询最简单方式

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

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);
        }));
    };
}