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luosheng
2023-03-01 09:36:07 +08:00
parent 46222348be
commit a8c9fefbce
80 changed files with 2227 additions and 1921 deletions
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50
Libraries/h-opc/Common/ClientExtensions.cs
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@@ -2,33 +2,33 @@
namespace Hylasoft.Opc.Common
{
/// <summary>
/// Useful extension methods for OPC Clients
/// </summary>
public static class ClientExtensions
{
/// <summary>
/// Reads a tag from the OPC. If for whatever reason the read fails (Tag doesn't exist, server not available) returns a default value
/// Useful extension methods for OPC Clients
/// </summary>
/// <param name="client">the opc client to use for the read</param>
/// <param name="tag">The fully qualified identifier of the tag</param>
/// <param name="defaultValue">the default value to read if the read fails</param>
/// <returns></returns>
public static ReadEvent<T> ReadOrdefault<T>(this IClient<Node> client, string tag, T defaultValue = default(T))
public static class ClientExtensions
{
try
{
return client.Read<T>(tag);
}
catch (OpcException)
{
var readEvent = new ReadEvent<T>();
readEvent.Quality = Quality.Good;
readEvent.Value = defaultValue;
readEvent.SourceTimestamp = DateTime.Now;
readEvent.ServerTimestamp = DateTime.Now;
return readEvent;
}
/// <summary>
/// Reads a tag from the OPC. If for whatever reason the read fails (Tag doesn't exist, server not available) returns a default value
/// </summary>
/// <param name="client">the opc client to use for the read</param>
/// <param name="tag">The fully qualified identifier of the tag</param>
/// <param name="defaultValue">the default value to read if the read fails</param>
/// <returns></returns>
public static ReadEvent<T> ReadOrdefault<T>(this IClient<Node> client, string tag, T defaultValue = default(T))
{
try
{
return client.Read<T>(tag);
}
catch (OpcException)
{
var readEvent = new ReadEvent<T>();
readEvent.Quality = Quality.Good;
readEvent.Value = defaultValue;
readEvent.SourceTimestamp = DateTime.Now;
readEvent.ServerTimestamp = DateTime.Now;
return readEvent;
}
}
}
}
}