Question

我有一个DataGrid，它只显示某个类的某些属性。

我想要做的是，按列顺序获取绑定属性的列表，我该如何实现？

还有一件事，我只想要可见的列。

[编辑]

以下是我在类属性中搜索文本时使用的内容，此时它会搜索所有属性。

这将更改为仅搜索DataGrid上可见的属性

public static class FullTextSearch<T>
{

    public static bool Match(T item, string searchTerm)
    {
        bool match = _properties.Select(prop => prop(item)).Any(value => value != null && value.ToLower().Contains(searchTerm.ToLower()));
        return match;
    }

    private static List<Func<T, string>> _properties;

    public static void FullTextSearchInit()
    {
        _properties = GetPropertyFunctions().ToList();
    }

    public static IEnumerable<Func<T, string>> GetPropertyFunctions()
    {
        var stringProperties = GetStringPropertyFunctions();
        var intProperties = GetIntPropertyFunctions();
        var decimalProperties = GetDecimalPropertyFunctions();
        var dateTimeProperties = GetDateTimePropertyFunctions();
        return stringProperties.Concat(decimalProperties).Concat(intProperties).Concat(dateTimeProperties);
    }

    public static IEnumerable<Func<T, string>> GetStringPropertyFunctions()
    {
        var propertyInfos = typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance | BindingFlags.GetProperty | BindingFlags.SetProperty)
            .Where(p => p.PropertyType == typeof(string)).ToList();

        var properties = propertyInfos.Select(GetStringPropertyFunc);
        return properties;
    }

    public static Func<T, string> GetStringPropertyFunc(PropertyInfo propInfo)
    {
        ParameterExpression x = System.Linq.Expressions.Expression.Parameter(typeof(T), "x");
        Expression<Func<T, string>> expression = System.Linq.Expressions.Expression.Lambda<Func<T, string>>(System.Linq.Expressions.Expression.Property(x, propInfo), x);
        Func<T, string> propertyAccessor = expression.Compile();
        return propertyAccessor;
    }

    public static IEnumerable<Func<T, string>> GetIntPropertyFunctions()
    {
        var propertyInfos = typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance | BindingFlags.GetProperty | BindingFlags.SetProperty)
            .Where(p => p.PropertyType == typeof(int)).ToList();

        var properties = propertyInfos.Select(GetIntPropertyFunc);
        return properties;
    }

    public static Func<T, string> GetIntPropertyFunc(PropertyInfo propInfo)
    {
        ParameterExpression x = System.Linq.Expressions.Expression.Parameter(typeof(T), "x");
        Expression<Func<T, int>> expression = System.Linq.Expressions.Expression.Lambda<Func<T, int>>(System.Linq.Expressions.Expression.Property(x, propInfo), x);
        Func<T, int> propertyAccessor = expression.Compile();
        return (T item) => propertyAccessor(item).ToString();
    }

    public static IEnumerable<Func<T, string>> GetDecimalPropertyFunctions()
    {
        var propertyInfos = typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance | BindingFlags.GetProperty | BindingFlags.SetProperty)
            .Where(p => p.PropertyType == typeof(decimal)).ToList();

        var properties = propertyInfos.Select(GetDecimalPropertyFunc);
        return properties;
    }

    public static Func<T, string> GetDecimalPropertyFunc(PropertyInfo propInfo)
    {
        ParameterExpression x = System.Linq.Expressions.Expression.Parameter(typeof(T), "x");
        Expression<Func<T, decimal>> expression = System.Linq.Expressions.Expression.Lambda<Func<T, decimal>>(System.Linq.Expressions.Expression.Property(x, propInfo), x);
        Func<T, decimal> propertyAccessor = expression.Compile();
        return (T item) => propertyAccessor(item).ToString();
    }

    public static IEnumerable<Func<T, string>> GetDateTimePropertyFunctions()
    {
        var propertyInfos = typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance | BindingFlags.GetProperty | BindingFlags.SetProperty)
            .Where(p => p.PropertyType == typeof(DateTime)).ToList();

        var properties = propertyInfos.Select(GetDateTimePropertyFunc);
        return properties;
    }

    public static Func<T, string> GetDateTimePropertyFunc(PropertyInfo propInfo)
    {
        ParameterExpression x = System.Linq.Expressions.Expression.Parameter(typeof(T), "x");
        Expression<Func<T, DateTime>> expression = System.Linq.Expressions.Expression.Lambda<Func<T, DateTime>>(System.Linq.Expressions.Expression.Property(x, propInfo), x);
        Func<T, DateTime> propertyAccessor = expression.Compile();
        return (T item) => propertyAccessor(item).ToString();
    }
}

以下代码是我如何调用它，它找到与搜索值匹配的所有属性并将项添加到列表中，处理此列表并将其添加到DataGrid上的SelectedItems属性。

从长远来看，我想让它足够通用，可以在任何DataGrid上使用。因此，它不需要搜索所有属性，而是需要更具体，如果我想提供下一个和上一个搜索功能，要转到下一个或上一个单元格匹配，我需要按照与DataGrid列匹配的顺序获取这些属性。

最后，当我打电话时，我想删除硬编码的班级名称：
FullTextSearch＆LT; UserViewModel＆GT; .FullTextSearchInit（）;
和
FullTextSearch＆LT; UserViewModel＆GT; .Match（）
但这将是另一个问题

string sv = SearchValue;
this.Target.SelectedItems.Clear();

var itemsSource = this.Target.Items as IEnumerable;

List<Object> tempItems = new List<Object>();

FullTextSearch<UserViewModel>.FullTextSearchInit();

if (itemsSource != null)
{
    foreach (var item in itemsSource)
    {
        if (FullTextSearch<UserViewModel>.Match((UserViewModel)item, sv))
        {
            tempItems.Add(item);
        }
    }
    if (tempItems.Count > 0)
    {
        //Add found items to SelectedItems
    }
}

Answer 1

我不确定这是否有帮助：

var visibleColumns = grid.Columns.Where(c => c.Visibility == System.Windows.Visibility.Visible).ToList();

如何获取DataGrid上显示的属性列？

1 个答案: