我查看了源代码,没有看到可以使用谓词删除的任何地方。但是,以下扩展方法应提供您正在寻找的功能:
using System.Linq.Expressions;
using SQLite;
using System.Collections.Generic;
public static class DeleteExtensions
{
public static int Delete<T>(this TableQuery<T> tableQuery, Expression<Func<T, bool>> predExpr)
{
BindingFlags flags = BindingFlags.Instance | BindingFlags.NonPublic;
Type type = tableQuery.GetType();
MethodInfo method = type.GetMethod("CompileExpr", flags);
if (predExpr.NodeType == ExpressionType.Lambda) {
var lambda = (LambdaExpression)predExpr;
var pred = lambda.Body;
var args = new List<object> ();
var w = method.Invoke(tableQuery, new object[] {pred, args});
var compileResultType = w.GetType();
var prop = compileResultType.GetProperty("CommandText");
string commandText = prop.GetValue(w, null).ToString();
var cmdText = "delete from \"" + tableQuery.Table.TableName + "\"";
cmdText += " where " + commandText;
var command = tableQuery.Connection.CreateCommand (cmdText, args.ToArray ());
int result = command.ExecuteNonQuery();
return result;
} else {
throw new NotSupportedException ("Must be a predicate");
}
}
}
但是,我不确定使用 TableQuery 类的可预测性如何,我认为这就是您目前被迫手动执行删除和更新的原因。所以测试和使用需要您自担风险:)