public Evaluator(EvaluatorItem item)
{
EvaluatorItem[] items = { item };
ConstructEvaluator(items);
}
public Evaluator(EvaluatorItem[] items)
{
ConstructEvaluator(items);
}
public Evaluator(EvaluatorItem item)
{
EvaluatorItem[] items = { item };
ConstructEvaluator(items);
}
private void ConstructEvaluator(EvaluatorItem[] items)
{
CSharpCodeProvider comp = new CSharpCodeProvider();
CompilerParameters cp = new CompilerParameters();
cp.ReferencedAssemblies.Add("system.dll");
cp.ReferencedAssemblies.Add("system.data.dll");
cp.ReferencedAssemblies.Add("system.xml.dll");
cp.GenerateExecutable = false;
cp.GenerateInMemory = true;
StringBuilder code = new StringBuilder();
code.Append("using System; \n");
code.Append("using System.Data; \n");
code.Append("using System.Data.SqlClient; \n");
code.Append("using System.Data.OleDb; \n");
code.Append("using System.Xml; \n");
code.Append("namespace ADOGuy { \n");
code.Append(" public class _Evaluator { \n");
foreach (EvaluatorItem item in items) {
code.AppendFormat(" public {0} {1}() ",
item.ReturnType.Name,
item.Name);
code.Append("{ ");
code.AppendFormat(" return ({0}); ", item.Expression);
code.Append("}\n");
}
code.Append("} }");
CompilerResults cr = comp.CompileAssemblyFromSource(cp, code.ToString());
cp.ReferencedAssemblies.Clear();
cp = null;
code.Clear();
code = null;
if (cr.Errors.HasErrors) {
StringBuilder error = new StringBuilder();
error.Append("Error Compiling Expression: ");
foreach (CompilerError err in cr.Errors) {
error.AppendFormat("{0}\n", err.ErrorText);
}
throw new Exception("Error Compiling Expression: " + error.ToString());
}
Assembly a = cr.CompiledAssembly;
_Compiled = a.CreateInstance("ADOGuy._Evaluator");
comp = null;
cp = null;
cr = null;
a = null;
for (int i = 0; i < items.Length; i++) {
items[i] = null;
}
items = null;
}