將二維字串陣列作為WPF ListView的ItemSource
阿新 • • 發佈:2019-02-10
在WPF中,平時我們使用繫結,是將一個物件陣列當作資料來源,而物件又有很多屬性,間接的相當於二維陣列,但這樣做我們事先要知道物件有什麼屬性,有幾個屬性才能繫結,萬一不確定ListView的列有多少行,需要在執行時才能確定呢?舉例如下:
第一張圖:
第二張圖:
這兩張圖的資料的列數不一樣,還有可能有其他列數不一樣的檔案資料,現在的需求是:要求我們的WPF ListView能夠載入檔案,然後顯示出來。
因為有不確定性,所以無法事先定義Model來繫結到ListView上去。如果是Winform的Listview可以一列一列的賦值,但是WPF怎麼實現呢?請看:
首先我們要獲取列名:用一個string的陣列表示好了,用一個二維string陣列表示資料:
string[] headers = new string[] { "姓名", "年齡", "身高" };
string[][] datas = new string[][]
{
new string[] { "111","1","165"},
new string[] { "222","2","165"}
};
要注意headers 的長度與datas的第二個維度的長度要一樣。
本示例前臺程式碼:
<Window x:Class="二維陣列繫結ListView.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:二維陣列繫結ListView"
mc:Ignorable="d"
Title="MainWindow" Height ="350" Width="525" Loaded="Window_Loaded">
<Grid>
<ListView Name="lv"></ListView>
</Grid>
</Window>
動態建立ListView的列(根據headers的長度):
private void GenerateColumns(ListView listView, string[] headers)
{
if (headers == null || headers.Length == 0)
return;
GridView gridView = new GridView();
listView.View = gridView;
for (int i = 0; i < headers.Length; i++)
{
GridViewColumn column = new GridViewColumn();
column.Header = headers[i];//設定列名稱
//此處設定陣列的繫結,陣列取第0個元素為list[0],通過索引器取
column.DisplayMemberBinding = new Binding(string.Format("[{0}]", i));
gridView.Columns.Add(column);
}
}
其中最重要的一句是:column.DisplayMemberBinding = new Binding(string.Format(“[{0}]”, i));動態繫結字串數組裡的元素
全部前臺程式碼貼出來如下:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace 二維陣列繫結ListView
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
private void Window_Loaded(object sender, RoutedEventArgs e)
{
string[] headers = new string[] { "姓名", "年齡", "身高" };
string[][] datas = new string[][]
{
new string[] { "111","1","165"},
new string[] { "222","2","165"}
};
//根據Header長度生產列
GenerateColumns(lv, headers);
//設定資料來源
lv.ItemsSource = datas;
}
private void GenerateColumns(ListView listView, string[] headers)
{
if (headers == null || headers.Length == 0)
return;
GridView gridView = new GridView();
listView.View = gridView;
for (int i = 0; i < headers.Length; i++)
{
GridViewColumn column = new GridViewColumn();
column.Header = headers[i];//設定列名稱
//此處設定陣列的繫結,陣列取第0個元素為list[0],通過索引器取
column.DisplayMemberBinding = new Binding(string.Format("[{0}]", i));
gridView.Columns.Add(column);
}
}
}
}
執行結果:
增加header的列:
private void Window_Loaded(object sender, RoutedEventArgs e)
{
//string[] headers = new string[] { "姓名", "年齡", "身高" };
//string[][] datas = new string[][]
//{
// new string[] { "111","1","165"},
// new string[] { "222","2","165"}
//};
string[] headers = new string[] { "姓名", "年齡", "身高","體重","學歷","戶籍" };
string[][] datas = new string[][]
{
new string[] { "111","1","165","45KG","本科","湖北"},
new string[] { "222","2","165","45KG","大專","湖南"}
};
//根據Header長度生產列
GenerateColumns(lv, headers);
//設定資料來源
lv.ItemsSource = datas;
}
執行結果如下:
這樣就解決了列不確定時,需要用ListView動態顯示和繫結資料的問題