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EventArgs Example
In one my past posts, I talked about that CryptoCollaboration using the EventArgs base class because it keeps things nice and generalized, allowing for expanasion for the handling of future event integration. A person emailed me and asked for a practical example of when would use such a thing in a SharePoint WebPart. Eh, ok.
I am going to use an example of a progress class, that, well, as you can guess will display the progress of some sort of execution that happens with a SharePoint WebPart.
The first class is the Process Arguments class (ProcessArgs), that inherits from the EventArgs base class.
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public class ProgressArgs : EventArgs
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{
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private int m_nPercentageComplete = 0;
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private DataRow m_oDataRow;
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public ProgressArgs(DataRow dataRow, int percentageComplete)
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{
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this.m_oDataRow = dataRow;
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this.m_nPercentageComplete = percentageComplete;
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}
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public DataRow CurrentDataRow
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{
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get
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{
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return this.m_oDataRow;
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}
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}
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public int PercentageComplete
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{
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get
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{
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return this.m_nPercentageComplete;
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}
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}
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}
In the next class, there will be the establishment of the event handler that will be called from a sister class by use of a delegate.
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public delegate void ProgressEventHandler(object sender, ProgressArgs e);
Now that the delegate is established, you can call it in some general class file.
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public event ProgressEventHandler ProgressEvent;
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protected virtual void OnProgress(ProgressArgs e)
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{
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if (this.ProgressEvent != null)
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{
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this.ProgressEvent(this, e);
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}
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}
Then calculate out the progress.
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ProgressArgs e = new ProgressArgs(row, (int) ((((double) num) / ((double) this.DBDataTable.Rows.Count)) * 100));
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this.OnProgress(e);
I am not saying that this is the only way to do it, but with applications that you plan on extending later it is the route that I have choosen to go in the past. I may at some point explore the deficiencies in a such an approach, however at this current time I just want to finish the damn thing.
Article Or Research Filed Under SharePoint Development.
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