private void btnApprove_Click(object sender, EventArgs e)
{
Material material = new Material
{
MaterialID = Guid.NewGuid(),
Name = txtName.Text,
PartNumber = txtPartNumber.Text,
DrawingNumber = txtDrawingNumber.Text,
Budget = decimal.Parse(txtBudget.Text)
};
Approver bob = new EngineeringApprover();
Approver ted = new PurchasingApprover();
Approver alice = new FinanceApprover();
bob.SetNextApprover(ted);
ted.SetNextApprover(alice);
string reason = "";
if (bob.ApproveMaterial(material, ref reason))
{
reason = "Approved. " + reason;
}
else
{
reason = "Disapproved. " + reason;
}
txtResult.Text = reason;
}
public override bool ApproveMaterial(Material material, ref string reason)
{
if (material.Budget < 100000)
{
if (NextApprover != null)
{
// finance may be the end of the chain, but this allows changes later
NextApprover.ApproveMaterial(material, ref reason);
}
return true;
}
else
{
reason = "This is way too much - find another way!";
return false;
}
}
public override bool ApproveMaterial(Material material, ref string reason)
{
bool isValid = true;
if (string.IsNullOrWhiteSpace(material.DrawingNumber))
{
isValid = false;
reason = "There is no drawing for this material";
}
if (string.IsNullOrWhiteSpace(material.PartNumber))
{
isValid = false;
reason = "There is no part number for this material";
}
if (isValid)
{
if (NextApprover != null)
{
return NextApprover.ApproveMaterial(material, ref reason);
}
}
return isValid;
}
public abstract bool ApproveMaterial(Material material, ref string reason);
