public Expression GetFilterExpression(TableFilterCompareOperator compareOperator, Expression leftExpr, Expression rightExpr)
{
rightExpr = Expression.Convert(rightExpr, _type);
switch (compareOperator)
{
case TableFilterCompareOperator.IsNull:
case TableFilterCompareOperator.Equals:
return(Expression.Equal(leftExpr, rightExpr));
case TableFilterCompareOperator.IsNotNull:
case TableFilterCompareOperator.NotEquals:
return(Expression.NotEqual(leftExpr, rightExpr));
case TableFilterCompareOperator.GreaterThan:
return(Expression.GreaterThan(leftExpr, rightExpr));
case TableFilterCompareOperator.GreaterThanOrEquals:
return(Expression.GreaterThanOrEqual(leftExpr, rightExpr));
case TableFilterCompareOperator.LessThan:
return(Expression.LessThan(leftExpr, rightExpr));
case TableFilterCompareOperator.LessThanOrEquals:
return(Expression.LessThanOrEqual(leftExpr, rightExpr));
}
throw new InvalidOperationException();
}
public Expression GetFilterExpression(TableFilterCompareOperator compareOperator, Expression leftExpr, Expression rightExpr)
{
leftExpr = RemoveMilliseconds(leftExpr);
rightExpr = RemoveMilliseconds(rightExpr);
switch (compareOperator)
{
case TableFilterCompareOperator.IsNull:
case TableFilterCompareOperator.Equals:
return(Expression.Equal(leftExpr, rightExpr));
case TableFilterCompareOperator.IsNotNull:
case TableFilterCompareOperator.NotEquals:
return(Expression.NotEqual(leftExpr, rightExpr));
case TableFilterCompareOperator.GreaterThan:
return(Expression.GreaterThan(leftExpr, rightExpr));
case TableFilterCompareOperator.GreaterThanOrEquals:
return(Expression.GreaterThanOrEqual(leftExpr, rightExpr));
case TableFilterCompareOperator.LessThan:
return(Expression.LessThan(leftExpr, rightExpr));
case TableFilterCompareOperator.LessThanOrEquals:
return(Expression.LessThanOrEqual(leftExpr, rightExpr));
case TableFilterCompareOperator.TheSameDateWith:
return(Expression.Equal(Expression.Property(leftExpr, "Date"),
Expression.Property(rightExpr, "Date")));
}
throw new InvalidOperationException();
}
private Expression GetCaseInsensitiveСomparation(TableFilterCompareOperator compareOperator, Expression leftExpr, Expression rightExpr)
{
MethodInfo miLower = typeof(string).GetMethod("ToLower", Array.Empty <Type>());
Expression notNull = Expression.NotEqual(leftExpr, Expression.Constant(null));
MethodCallExpression lowerLeftExpr = Expression.Call(leftExpr, miLower);
MethodCallExpression lowerRightExpr = Expression.Call(rightExpr, miLower);
switch (compareOperator)
{
case TableFilterCompareOperator.IsNull:
return(Expression.Equal(leftExpr, rightExpr));
case TableFilterCompareOperator.Equals:
return(Expression.AndAlso(notNull, Expression.Equal(lowerLeftExpr, lowerRightExpr)));
case TableFilterCompareOperator.IsNotNull:
return(Expression.NotEqual(leftExpr, rightExpr));
case TableFilterCompareOperator.NotEquals:
return(Expression.AndAlso(notNull, Expression.NotEqual(lowerLeftExpr, lowerRightExpr)));
default:
string methodName = Enum.GetName(typeof(TableFilterCompareOperator), compareOperator);
MethodInfo mi = typeof(string).GetMethod(methodName, new[] { typeof(string) });
if (mi == null)
{
throw new MissingMethodException("There is no method - " + methodName);
}
return(Expression.AndAlso(notNull, Expression.Call(lowerLeftExpr, mi, lowerRightExpr)));
}
}
public TableFilter(string text, object value, bool selected, TableFilterCompareOperator filterCompareOperator, TableFilterCondition filterCondition)
{
this.Text = text;
this.Value = value;
this.Selected = selected;
this.FilterCompareOperator = filterCompareOperator;
this.FilterCondition = filterCondition;
}
public Expression GetFilterExpression(TableFilterCompareOperator compareOperator, Expression leftExpr, Expression rightExpr)
{
switch (compareOperator)
{
case TableFilterCompareOperator.IsNull:
case TableFilterCompareOperator.Equals:
return(Expression.Equal(leftExpr, rightExpr));
case TableFilterCompareOperator.IsNotNull:
case TableFilterCompareOperator.NotEquals:
return(Expression.NotEqual(leftExpr, rightExpr));
default:
throw new InvalidOperationException($"The compare operator {compareOperator} is not supported for Guid type.");
}
}
public Expression GetFilterExpression(TableFilterCompareOperator compareOperator, Expression leftExpr, Expression rightExpr)
{
switch (compareOperator)
{
case TableFilterCompareOperator.IsNull:
case TableFilterCompareOperator.Equals:
return(Expression.Equal(leftExpr, rightExpr));
case TableFilterCompareOperator.IsNotNull:
case TableFilterCompareOperator.NotEquals:
return(Expression.NotEqual(leftExpr, rightExpr));
case TableFilterCompareOperator.Contains:
{
MethodInfo mi = typeof(Enum).GetMethod(nameof(Enum.HasFlag));
if (leftExpr.Type.IsGenericType)
{
Expression notNull = Expression.NotEqual(leftExpr, Expression.Constant(null));
leftExpr = Expression.MakeMemberAccess(leftExpr, leftExpr.Type.GetMember("Value")[0]);
rightExpr = Expression.MakeMemberAccess(rightExpr, rightExpr.Type.GetMember("Value")[0]);
rightExpr = Expression.Convert(rightExpr, typeof(Enum));
return(Expression.AndAlso(notNull, Expression.Call(leftExpr, mi, rightExpr)));
}
rightExpr = Expression.Convert(rightExpr, typeof(Enum));
return(Expression.Call(leftExpr, mi, rightExpr));
}
case TableFilterCompareOperator.NotContains:
{
MethodInfo mi = typeof(Enum).GetMethod(nameof(Enum.HasFlag));
if (leftExpr.Type.IsGenericType)
{
Expression notNull = Expression.NotEqual(leftExpr, Expression.Constant(null));
leftExpr = Expression.MakeMemberAccess(leftExpr, leftExpr.Type.GetMember("Value")[0]);
rightExpr = Expression.MakeMemberAccess(rightExpr, rightExpr.Type.GetMember("Value")[0]);
rightExpr = Expression.Convert(rightExpr, typeof(Enum));
return(Expression.Equal(Expression.AndAlso(notNull, Expression.Call(leftExpr, mi, rightExpr)), Expression.Constant(false, typeof(bool))));
}
rightExpr = Expression.Convert(rightExpr, typeof(Enum));
return(Expression.Equal(Expression.Call(leftExpr, mi, rightExpr), Expression.Constant(false, typeof(bool))));
}
}
throw new InvalidOperationException();
}
public Expression GetFilterExpression(TableFilterCompareOperator compareOperator, Expression leftExpr, Expression rightExpr)
{
return(GetCaseInsensitiveСomparation(compareOperator, leftExpr, rightExpr));
}
public Expression GetFilterExpression(TableFilterCompareOperator compareOperator, Expression leftExpr, Expression rightExpr)
{
switch (compareOperator)
{
case TableFilterCompareOperator.IsNull:
return(Expression.Equal(leftExpr, rightExpr));
case TableFilterCompareOperator.IsNotNull:
return(Expression.NotEqual(leftExpr, rightExpr));
}
if (leftExpr.Type.IsGenericType)
{
Expression notNull = Expression.NotEqual(leftExpr, Expression.Constant(null));
Expression isNull = Expression.Equal(leftExpr, Expression.Constant(null));
leftExpr = Expression.Property(leftExpr, "Value");
rightExpr = Expression.Property(rightExpr, "Value");
if (compareOperator != TableFilterCompareOperator.TheSameDateWith)
{
leftExpr = RemoveMilliseconds(leftExpr);
}
switch (compareOperator)
{
case TableFilterCompareOperator.Equals:
return(Expression.AndAlso(notNull, Expression.Equal(leftExpr, rightExpr)));
case TableFilterCompareOperator.NotEquals:
return(Expression.OrElse(isNull, Expression.NotEqual(leftExpr, rightExpr)));
case TableFilterCompareOperator.GreaterThan:
return(Expression.AndAlso(notNull, Expression.GreaterThan(leftExpr, rightExpr)));
case TableFilterCompareOperator.GreaterThanOrEquals:
return(Expression.AndAlso(notNull, Expression.GreaterThanOrEqual(leftExpr, rightExpr)));
case TableFilterCompareOperator.LessThan:
return(Expression.AndAlso(notNull, Expression.LessThan(leftExpr, rightExpr)));
case TableFilterCompareOperator.LessThanOrEquals:
return(Expression.AndAlso(notNull, Expression.LessThanOrEqual(leftExpr, rightExpr)));
case TableFilterCompareOperator.TheSameDateWith:
return(Expression.AndAlso(notNull,
Expression.Equal(
Expression.Property(leftExpr, "Date"),
Expression.Property(rightExpr, "Date"))));
}
throw new InvalidOperationException();
}
if (compareOperator != TableFilterCompareOperator.TheSameDateWith)
{
leftExpr = RemoveMilliseconds(leftExpr);
}
switch (compareOperator)
{
case TableFilterCompareOperator.Equals:
return(Expression.Equal(leftExpr, rightExpr));
case TableFilterCompareOperator.NotEquals:
return(Expression.NotEqual(leftExpr, rightExpr));
case TableFilterCompareOperator.GreaterThan:
return(Expression.GreaterThan(leftExpr, rightExpr));
case TableFilterCompareOperator.GreaterThanOrEquals:
return(Expression.GreaterThanOrEqual(leftExpr, rightExpr));
case TableFilterCompareOperator.LessThan:
return(Expression.LessThan(leftExpr, rightExpr));
case TableFilterCompareOperator.LessThanOrEquals:
return(Expression.LessThanOrEqual(leftExpr, rightExpr));
case TableFilterCompareOperator.TheSameDateWith:
return(Expression.Equal(
Expression.Property(leftExpr, "Date"),
Expression.Property(rightExpr, "Date")));
}
throw new InvalidOperationException();
}
