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去掉 ExcelConnection.Open方法中的抛出异常：

Open方法修改后的代码应该是 

public override void Open()
{
    try
    {
        string str = y.d(this.GetType().AssemblyQualifiedName);
        if (str == null)
        {
        }
        if (y.c(str) != y.n)
        {
        }
        this.l = ConnectionState.Connecting;
        this.a(this.i, this.p);
        this.l = ConnectionState.Open;
    }
    catch (Exception exception1)
    {
        ProjectData.SetProjectError(exception1);
        Exception exception = exception1;
        this.l = ConnectionState.Closed;
        throw;
    }
}