问题
I'm trying to serialise data from a ListView as well as then deserialising it and also consequently fill the ListView with the saved data.
public List<ListViewItem> SaveListView(ListView LV)
{
System.Collections.Generic.List<ListViewItem> lSavedLV = new List<ListViewItem>();
for (int i = 0; (i <= animalList.Count - 1); i++)
{
lSavedLV.Add(LV.Items[i]);
}
return lSavedLV;
}
Is that a plausible solution for the saving part? Is that the way to go, if I plan to fill the ListView with such serialised data? Is this then a matching loading method:
public ListView LoadListView(List<ListViewItem> L)
{
ListView lv = new ListView();
for (int i = 0; (i <= (L.Count - 1)); i++)
{
ListViewItem lvi = new ListViewItem();
lvi = ((ListViewItem)(L[i]));
lv.Items.Add(lvi);
}
return lv;
}
My mind really wanders, I've been trying a few different things but it seems that the there is something wrong with the loading/filling of the ListView. It's detail view. Ideas, tips?
回答1:
Not trying to be patronizing here, but a ListView is presentation logic. A ListViewItem is presentation logic. You should not serialize those. What you should do is serialize your data, not its visual representation.
Why not have a class which contains the data to be visualized?
public class DataIWannaVisualize
{
// ...
}
Make it serializable by giving it the appropriate attribute:
[Serializable]
public class DataIWannaVisualize
And have a List of these data objects.
IList<DataIWannaVisualize> dataList = new List<DataIWannaVisualize>();
This list contains the data that you are about to make visible, on which you do your changes, and so on. And which, of course, can also easily be serialized or deserialized.
using (Stream stream = File.Open("data.bin", FileMode.Create))
{
BinaryFormatter formatter = new BinaryFormatter();
formatter.Serialize(stream, dataList);
}
Now, your ListView. Fill it by having a handler on the Load event of your Form.
private void Form1_Load(object sender, EventArgs e)
{
foreach (DataIWannaVisualize dataObject in dataList)
{
ListViewItem item = new ListViewItem();
// TODO: Fill the item with the desired data.
listView1.Items.Add(item);
}
}
And best of all, you won't have to worry about serializing UI logic classes.
回答2:
Callash already provided an sufficient answer but if you want to see a full example ...
It's not using a ListView, but a DataGridView ... but it will show you how to persist data and how to load it
using System;
using System.Collections.Generic;
using System.Windows.Forms;
namespace DataExample
{
public class Form1 : Form
{
private string _Filename = "MyAnimals.xml";
public List<Animal> myAnimals = new List<Animal>();
public Form1()
{
InitializeComponent();
}
public void RegisterDog(String name)
{
myAnimals.Add(new Dog { Name = name });
}
public void RegisterCat(String name)
{
myAnimals.Add(new Cat { Name = name });
}
private DataGridView dataGridView1;
private Button button1;
private Button button2;
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.IContainer components = null;
/// <summary>
/// Clean up any resources being used.
/// </summary>
/// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}
#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.dataGridView1 = new System.Windows.Forms.DataGridView();
this.button1 = new System.Windows.Forms.Button();
this.button2 = new System.Windows.Forms.Button();
((System.ComponentModel.ISupportInitialize)(this.dataGridView1)).BeginInit();
this.SuspendLayout();
//
// dataGridView1
//
this.dataGridView1.AllowUserToAddRows = false;
this.dataGridView1.AllowUserToDeleteRows = false;
this.dataGridView1.ColumnHeadersHeightSizeMode = System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize;
this.dataGridView1.Location = new System.Drawing.Point(12, 12);
this.dataGridView1.Name = "dataGridView1";
this.dataGridView1.Size = new System.Drawing.Size(260, 199);
this.dataGridView1.TabIndex = 0;
//
// button1
//
this.button1.Location = new System.Drawing.Point(12, 229);
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size(85, 21);
this.button1.TabIndex = 1;
this.button1.Text = "persist to file";
this.button1.UseVisualStyleBackColor = true;
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// button2
//
this.button2.Location = new System.Drawing.Point(151, 229);
this.button2.Name = "button2";
this.button2.Size = new System.Drawing.Size(121, 21);
this.button2.TabIndex = 2;
this.button2.Text = "make dummy objects";
this.button2.UseVisualStyleBackColor = true;
this.button2.Click += new System.EventHandler(this.button2_Click);
//
// Form1
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(284, 262);
this.Controls.Add(this.button2);
this.Controls.Add(this.button1);
this.Controls.Add(this.dataGridView1);
this.Name = "Form1";
this.Text = "Form1";
this.Load += new System.EventHandler(this.Form1_Load);
((System.ComponentModel.ISupportInitialize)(this.dataGridView1)).EndInit();
this.ResumeLayout(false);
}
#endregion
private void button2_Click(object sender, EventArgs e)
{
RegisterDog("SomeDog");
RegisterCat("SomeCat");
dataGridView1.DataSource = null;
dataGridView1.DataSource = myAnimals;
}
private void button1_Click(object sender, EventArgs e)
{
try
{
using (System.Xml.XmlWriter xmlWriter = System.Xml.XmlWriter.Create(_Filename))
{
System.Xml.Serialization.XmlSerializer serializer = new System.Xml.Serialization.XmlSerializer(typeof(List<Animal>), new Type[] { typeof(Dog), typeof(Cat) });
serializer.Serialize(xmlWriter, myAnimals);
}
}
catch { }
}
private void Form1_Load(object sender, EventArgs e)
{
try
{
using (System.Xml.XmlReader xmlReader = System.Xml.XmlReader.Create(_Filename))
{
System.Xml.Serialization.XmlSerializer serializer = new System.Xml.Serialization.XmlSerializer(typeof(List<Animal>), new Type[] { typeof(Dog), typeof(Cat) });
myAnimals = (List<Animal>)serializer.Deserialize(xmlReader);
dataGridView1.DataSource = myAnimals;
}
}
catch { }
}
}
[Serializable]
public abstract class Animal
{
public String Name { get; set; }
public abstract String Species { get; }
}
[Serializable]
public class Dog : Animal
{
public override string Species
{
get { return "Dog"; }
}
}
[Serializable]
public class Cat : Animal
{
public override string Species
{
get { return "Cat"; }
}
}
}
if it really has to be a ListView, you can use a loop like the one Callash has in his Form1_Load(...) to make new ListViewItems from your data once it has been deserialized ...
来源：https://stackoverflow.com/questions/16428310/c-sharp-serialising-deserialising-listview