C # tips: Tips on programming class set attributes

This article is about some inconspicuous programming tips.

I,

In the past, I wrote the following code:

public List<IMessageDataGroup> DataGroups { get; set; }

It is equivalent:

private List<IMessageDataGroup> _dataGroups = null;public List<IMessageDataGroup> DataGroups{get { return this._dataGroups; }set { this._dataGroups = value; }}

Therefore, each time you call this rule set attribute, you must determine whether it is empty:

if (messageCustomizeMode.DataGroups == null ||    messageCustomizeMode.DataGroups.Count == 0){    // TODO}else{    // TODO}

It's really annoying.

II,

Then, I will define the role roups attribute as follows:

private List<IMessageDataGroup> _dataGroups = null;public List<IMessageDataGroup> DataGroups{    get    {        if (this._dataGroups == null)        {            this._dataGroups = new List<IMessageDataGroup>();        }        return this._dataGroups;    }}

In this way, I don't have to worry about the empty rolling roups attribute:

if (messageCustomizeMode.DataGroups.Count == 0){    // TODO}else{    // TODO}

However, I encountered a little trouble in assigning values to this attribute.

Previously, I could do this:

messageCustomizeMode.DataGroups = currentDataGroups;

Now, I can only do this:

messageCustomizeMode.DataGroups.Clear();foreach (IMessageDataGroup item in currentDataGroups){    messageCustomizeMode.DataGroups.Add(item);}

Iii. Final solution

Finally, I decided to define the volume roups attribute as follows:

private List<IMessageDataGroup> _dataGroups = null;public List<IMessageDataGroup> DataGroups{    get    {    if (this._dataGroups == null)    {        this._dataGroups = new List<IMessageDataGroup>();    }    return this._dataGroups;    }    set    {    if (value != this._dataGroups)    {        if (this._dataGroups != null)        {            this._dataGroups.Clear();        }        this._dataGroups = value;    }    }}

In this way, first, I will never worry about it being empty when I reference the volume roups attribute later. Second, I can assign values directly as before.

Boring tips.